{ "license": "https://creativecommons.org/licenses/by/4.0/", "attribution": "Milkweed USA (https://milkweedusa.com), CC BY 4.0", "note": "Text and data are CC BY 4.0. Photographs carry their own licenses, listed per image on each page.", "generated": "2026-08-01", "count": 51, "states": [ { "code": "AK", "name": "Alaska", "region": "Pacific", "usdaZones": "1–8", "monarchFlyway": "none", "speciesCount": 0, "species": [], "note": "Alaska has no native milkweed. The state lies far outside the range of every Asclepias species, and monarch butterflies are not resident here; the handful of records are wind-blown strays. Gardeners wanting to help pollinators should plant native fireweed, willows and Alaskan asters instead.", "url": "https://milkweedusa.com/states/alaska/", "markdown": "https://milkweedusa.com/states/alaska/index.md" }, { "code": "ME", "name": "Maine", "region": "Northeast", "usdaZones": "3b–6a", "monarchFlyway": "eastern", "speciesCount": 5, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true } ], "note": "Maine sits at the northeastern edge of the monarch breeding range, where common milkweed colonizes old fields, blueberry barrens and roadsides. Coastal fog and a short season mean plants leaf out late but grow lush; swamp milkweed thrives along the state’s abundant wetland margins.", "url": "https://milkweedusa.com/states/maine/", "markdown": "https://milkweedusa.com/states/maine/index.md" }, { "code": "VT", "name": "Vermont", "region": "Northeast", "usdaZones": "3b–5b", "monarchFlyway": "eastern", "speciesCount": 7, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true } ], "note": "Vermont’s hayfields, hedgerows and river floodplains carry dense stands of common milkweed, and the Champlain Valley is one of New England’s most productive monarch breeding landscapes. Late-cut hay meadows are the single biggest thing a Vermont landowner can offer the species.", "url": "https://milkweedusa.com/states/vermont/", "markdown": "https://milkweedusa.com/states/vermont/index.md" }, { "code": "NH", "name": "New Hampshire", "region": "Northeast", "usdaZones": "3b–6a", "monarchFlyway": "eastern", "speciesCount": 8, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true } ], "note": "From the Merrimack Valley to the White Mountain foothills, New Hampshire’s milkweeds are concentrated in old fields and powerline corridors below about 2,000 feet. Poke milkweed appears along shaded woodland edges where the common species will not grow.", "url": "https://milkweedusa.com/states/new-hampshire/", "markdown": "https://milkweedusa.com/states/new-hampshire/index.md" }, { "code": "WA", "name": "Washington", "region": "Pacific", "usdaZones": "4a–9a", "monarchFlyway": "western", "speciesCount": 3, "species": [ { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "narrowleaf-milkweed", "scientificName": "Asclepias fascicularis", "commonName": "Narrowleaf Milkweed", "native": true }, { "slug": "pallid-milkweed", "scientificName": "Asclepias cryptoceras", "commonName": "Pallid Milkweed", "native": true } ], "note": "Nearly all of Washington’s milkweed is east of the Cascades, where showy milkweed lines irrigation ditches and the Columbia Basin’s shrub-steppe supports narrowleaf milkweed. Western Washington has very little native milkweed and correspondingly few breeding monarchs.", "url": "https://milkweedusa.com/states/washington/", "markdown": "https://milkweedusa.com/states/washington/index.md" }, { "code": "ID", "name": "Idaho", "region": "Mountain West", "usdaZones": "3a–7a", "monarchFlyway": "western", "speciesCount": 3, "species": [ { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "narrowleaf-milkweed", "scientificName": "Asclepias fascicularis", "commonName": "Narrowleaf Milkweed", "native": true }, { "slug": "pallid-milkweed", "scientificName": "Asclepias cryptoceras", "commonName": "Pallid Milkweed", "native": true } ], "note": "Showy milkweed follows the Snake River Plain and its irrigation network across southern Idaho, forming the state’s main monarch breeding habitat. Pallid milkweed turns up on dry clay barrens in the southwest corner.", "url": "https://milkweedusa.com/states/idaho/", "markdown": "https://milkweedusa.com/states/idaho/index.md" }, { "code": "MT", "name": "Montana", "region": "Mountain West", "usdaZones": "3a–6a", "monarchFlyway": "both", "speciesCount": 8, "species": [ { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "plains-milkweed", "scientificName": "Asclepias pumila", "commonName": "Plains Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "ovalleaf-milkweed", "scientificName": "Asclepias ovalifolia", "commonName": "Oval-leaf Milkweed", "native": true } ], "note": "Montana sits on the divide between eastern and western monarch populations, with showy milkweed along the Yellowstone and Missouri river systems and green comet milkweed on dry prairie. Riparian corridors matter enormously here, being the only reliably moist habitat for hundreds of miles.", "url": "https://milkweedusa.com/states/montana/", "markdown": "https://milkweedusa.com/states/montana/index.md" }, { "code": "ND", "name": "North Dakota", "region": "Great Plains", "usdaZones": "3a–4b", "monarchFlyway": "eastern", "speciesCount": 10, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "plains-milkweed", "scientificName": "Asclepias pumila", "commonName": "Plains Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "ovalleaf-milkweed", "scientificName": "Asclepias ovalifolia", "commonName": "Oval-leaf Milkweed", "native": true }, { "slug": "woolly-milkweed", "scientificName": "Asclepias lanuginosa", "commonName": "Woolly Milkweed", "native": true } ], "note": "North Dakota produces an outsized share of the eastern monarch population relative to its size, with common and showy milkweed abundant in Conservation Reserve Program grassland and prairie potholes. Oval-leaf milkweed occupies sandy prairie in the eastern counties.", "url": "https://milkweedusa.com/states/north-dakota/", "markdown": "https://milkweedusa.com/states/north-dakota/index.md" }, { "code": "MN", "name": "Minnesota", "region": "Midwest", "usdaZones": "3a–5a", "monarchFlyway": "eastern", "speciesCount": 13, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "ovalleaf-milkweed", "scientificName": "Asclepias ovalifolia", "commonName": "Oval-leaf Milkweed", "native": true }, { "slug": "woolly-milkweed", "scientificName": "Asclepias lanuginosa", "commonName": "Woolly Milkweed", "native": true } ], "note": "Minnesota is one of the highest-value monarch breeding states in the country, with common milkweed in old fields, swamp milkweed in the state’s countless wetlands and prairie milkweed on remnant tallgrass. Its official state butterfly is the monarch.", "url": "https://milkweedusa.com/states/minnesota/", "markdown": "https://milkweedusa.com/states/minnesota/index.md" }, { "code": "IL", "name": "Illinois", "region": "Midwest", "usdaZones": "5a–7a", "monarchFlyway": "eastern", "speciesCount": 17, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "meads-milkweed", "scientificName": "Asclepias meadii", "commonName": "Mead’s Milkweed", "native": true }, { "slug": "ovalleaf-milkweed", "scientificName": "Asclepias ovalifolia", "commonName": "Oval-leaf Milkweed", "native": true }, { "slug": "woolly-milkweed", "scientificName": "Asclepias lanuginosa", "commonName": "Woolly Milkweed", "native": true } ], "note": "Almost all of Illinois’ original tallgrass prairie is now cropland, so its milkweed survives in railroad rights of way, cemetery prairies and roadside ditches. Those remnants hold some of the best populations of prairie milkweed and Mead’s milkweed left anywhere.", "url": "https://milkweedusa.com/states/illinois/", "markdown": "https://milkweedusa.com/states/illinois/index.md" }, { "code": "WI", "name": "Wisconsin", "region": "Midwest", "usdaZones": "3b–5b", "monarchFlyway": "eastern", "speciesCount": 13, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "ovalleaf-milkweed", "scientificName": "Asclepias ovalifolia", "commonName": "Oval-leaf Milkweed", "native": true }, { "slug": "woolly-milkweed", "scientificName": "Asclepias lanuginosa", "commonName": "Woolly Milkweed", "native": true } ], "note": "Wisconsin’s sand counties, driftless-area bluff prairies and wetland edges give it more milkweed diversity than most northern states, including oval-leaf, woolly and prairie milkweed. Common milkweed in old dairy pasture remains the backbone of monarch production.", "url": "https://milkweedusa.com/states/wisconsin/", "markdown": "https://milkweedusa.com/states/wisconsin/index.md" }, { "code": "MI", "name": "Michigan", "region": "Midwest", "usdaZones": "4a–6b", "monarchFlyway": "eastern", "speciesCount": 13, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "ovalleaf-milkweed", "scientificName": "Asclepias ovalifolia", "commonName": "Oval-leaf Milkweed", "native": true }, { "slug": "woolly-milkweed", "scientificName": "Asclepias lanuginosa", "commonName": "Woolly Milkweed", "native": true } ], "note": "Michigan’s dune systems, oak savanna and old fields support a wide milkweed flora, and the state is a major staging area for fall monarch migration along both peninsulas’ shorelines. Fourleaf and poke milkweed occupy the state’s hardwood forests.", "url": "https://milkweedusa.com/states/michigan/", "markdown": "https://milkweedusa.com/states/michigan/index.md" }, { "code": "NY", "name": "New York", "region": "Northeast", "usdaZones": "3b–7b", "monarchFlyway": "eastern", "speciesCount": 11, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true } ], "note": "New York runs from Long Island’s pine barrens to the Adirondacks, and its milkweed flora spans that gradient: clasping milkweed in coastal sand, poke milkweed in northern hardwoods, common milkweed everywhere in between. Purple milkweed persists in scattered Hudson Valley remnants.", "url": "https://milkweedusa.com/states/new-york/", "markdown": "https://milkweedusa.com/states/new-york/index.md" }, { "code": "MA", "name": "Massachusetts", "region": "Northeast", "usdaZones": "5a–7b", "monarchFlyway": "eastern", "speciesCount": 8, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true } ], "note": "Massachusetts pairs abundant common milkweed in old fields with specialist sandplain species such as clasping milkweed on Cape Cod and the islands and swamp milkweed along coastal marshes. Sandplain grassland restoration is the state’s highest-leverage monarch work.", "url": "https://milkweedusa.com/states/massachusetts/", "markdown": "https://milkweedusa.com/states/massachusetts/index.md" }, { "code": "RI", "name": "Rhode Island", "region": "Northeast", "usdaZones": "5b–7a", "monarchFlyway": "eastern", "speciesCount": 8, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true } ], "note": "Small but well supplied: Rhode Island’s coastal grasslands and old fields carry common, swamp and butterfly milkweed, with clasping milkweed on the sandy south coast. Roadside mowing timing is the key management question in a state this densely settled.", "url": "https://milkweedusa.com/states/rhode-island/", "markdown": "https://milkweedusa.com/states/rhode-island/index.md" }, { "code": "OR", "name": "Oregon", "region": "Pacific", "usdaZones": "4a–9b", "monarchFlyway": "western", "speciesCount": 4, "species": [ { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "narrowleaf-milkweed", "scientificName": "Asclepias fascicularis", "commonName": "Narrowleaf Milkweed", "native": true }, { "slug": "pallid-milkweed", "scientificName": "Asclepias cryptoceras", "commonName": "Pallid Milkweed", "native": true }, { "slug": "heartleaf-milkweed", "scientificName": "Asclepias cordifolia", "commonName": "Heartleaf Milkweed", "native": true } ], "note": "Showy milkweed dominates the Willamette Valley and the state’s eastern high desert, while narrowleaf milkweed occupies southern Oregon’s drier valleys and heartleaf milkweed climbs into the Siskiyou foothills. Oregon is a critical spring corridor for western monarchs leaving the California coast.", "url": "https://milkweedusa.com/states/oregon/", "markdown": "https://milkweedusa.com/states/oregon/index.md" }, { "code": "NV", "name": "Nevada", "region": "Mountain West", "usdaZones": "4a–9b", "monarchFlyway": "western", "speciesCount": 18, "species": [ { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "narrowleaf-milkweed", "scientificName": "Asclepias fascicularis", "commonName": "Narrowleaf Milkweed", "native": true }, { "slug": "antelope-horns", "scientificName": "Asclepias asperula", "commonName": "Antelope Horns", "native": true }, { "slug": "poison-milkweed", "scientificName": "Asclepias subverticillata", "commonName": "Poison Milkweed", "native": true }, { "slug": "broadleaf-milkweed", "scientificName": "Asclepias latifolia", "commonName": "Broadleaf Milkweed", "native": true }, { "slug": "halls-milkweed", "scientificName": "Asclepias hallii", "commonName": "Hall’s Milkweed", "native": true }, { "slug": "pallid-milkweed", "scientificName": "Asclepias cryptoceras", "commonName": "Pallid Milkweed", "native": true }, { "slug": "dwarf-milkweed", "scientificName": "Asclepias involucrata", "commonName": "Dwarf Milkweed", "native": true }, { "slug": "wheel-milkweed", "scientificName": "Asclepias uncialis", "commonName": "Wheel Milkweed", "native": true }, { "slug": "woollypod-milkweed", "scientificName": "Asclepias eriocarpa", "commonName": "Woollypod Milkweed", "native": true }, { "slug": "heartleaf-milkweed", "scientificName": "Asclepias cordifolia", "commonName": "Heartleaf Milkweed", "native": true }, { "slug": "woolly-milkweed-vestita", "scientificName": "Asclepias vestita", "commonName": "Woolly Milkweed", "native": true }, { "slug": "desert-milkweed", "scientificName": "Asclepias erosa", "commonName": "Desert Milkweed", "native": true }, { "slug": "rush-milkweed", "scientificName": "Asclepias subulata", "commonName": "Rush Milkweed", "native": true }, { "slug": "mojave-milkweed", "scientificName": "Asclepias nyctaginifolia", "commonName": "Mojave Milkweed", "native": true }, { "slug": "whitestem-milkweed", "scientificName": "Asclepias albicans", "commonName": "Whitestem Milkweed", "native": true }, { "slug": "eastwoods-milkweed", "scientificName": "Asclepias eastwoodiana", "commonName": "Eastwood’s Milkweed", "native": true }, { "slug": "ruths-milkweed", "scientificName": "Asclepias ruthiae", "commonName": "Ruth’s Milkweed", "native": true } ], "note": "Nevada’s milkweeds cluster around water, with showy and narrowleaf milkweed along rivers, springs and irrigated valleys, and desert and rush milkweed in the southern Mojave. Pallid milkweed on Great Basin clay barrens is the state’s botanical prize.", "url": "https://milkweedusa.com/states/nevada/", "markdown": "https://milkweedusa.com/states/nevada/index.md" }, { "code": "WY", "name": "Wyoming", "region": "Mountain West", "usdaZones": "2b–6a", "monarchFlyway": "both", "speciesCount": 14, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "poison-milkweed", "scientificName": "Asclepias subverticillata", "commonName": "Poison Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "plains-milkweed", "scientificName": "Asclepias pumila", "commonName": "Plains Milkweed", "native": true }, { "slug": "broadleaf-milkweed", "scientificName": "Asclepias latifolia", "commonName": "Broadleaf Milkweed", "native": true }, { "slug": "engelmanns-milkweed", "scientificName": "Asclepias engelmanniana", "commonName": "Engelmann’s Milkweed", "native": true }, { "slug": "halls-milkweed", "scientificName": "Asclepias hallii", "commonName": "Hall’s Milkweed", "native": true }, { "slug": "pallid-milkweed", "scientificName": "Asclepias cryptoceras", "commonName": "Pallid Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "wheel-milkweed", "scientificName": "Asclepias uncialis", "commonName": "Wheel Milkweed", "native": true } ], "note": "Showy milkweed follows the North Platte, Bighorn and Green River corridors, and the state’s shortgrass plains hold plains, green comet and Engelmann’s milkweed. Wyoming straddles the eastern and western monarch flyways and its riparian ribbons carry nearly all the breeding.", "url": "https://milkweedusa.com/states/wyoming/", "markdown": "https://milkweedusa.com/states/wyoming/index.md" }, { "code": "SD", "name": "South Dakota", "region": "Great Plains", "usdaZones": "3b–5b", "monarchFlyway": "eastern", "speciesCount": 12, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "plains-milkweed", "scientificName": "Asclepias pumila", "commonName": "Plains Milkweed", "native": true }, { "slug": "engelmanns-milkweed", "scientificName": "Asclepias engelmanniana", "commonName": "Engelmann’s Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "ovalleaf-milkweed", "scientificName": "Asclepias ovalifolia", "commonName": "Oval-leaf Milkweed", "native": true }, { "slug": "woolly-milkweed", "scientificName": "Asclepias lanuginosa", "commonName": "Woolly Milkweed", "native": true } ], "note": "East river, common and prairie milkweed occupy tallgrass remnants and CRP fields; west river, the shortgrass plains support plains, Engelmann’s and green comet milkweed. The Missouri River corridor is the state’s primary monarch highway.", "url": "https://milkweedusa.com/states/south-dakota/", "markdown": "https://milkweedusa.com/states/south-dakota/index.md" }, { "code": "IA", "name": "Iowa", "region": "Midwest", "usdaZones": "4b–6a", "monarchFlyway": "eastern", "speciesCount": 16, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "meads-milkweed", "scientificName": "Asclepias meadii", "commonName": "Mead’s Milkweed", "native": true }, { "slug": "ovalleaf-milkweed", "scientificName": "Asclepias ovalifolia", "commonName": "Oval-leaf Milkweed", "native": true }, { "slug": "woolly-milkweed", "scientificName": "Asclepias lanuginosa", "commonName": "Woolly Milkweed", "native": true } ], "note": "Iowa produces a disproportionate share of the eastern monarch population, almost entirely from roadside plantings, CRP acres and cemetery prairies in a landscape that is otherwise more than 85 percent cultivated. The state’s integrated roadside vegetation management program is a national model.", "url": "https://milkweedusa.com/states/iowa/", "markdown": "https://milkweedusa.com/states/iowa/index.md" }, { "code": "IN", "name": "Indiana", "region": "Midwest", "usdaZones": "5b–7a", "monarchFlyway": "eastern", "speciesCount": 14, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true } ], "note": "Indiana’s milkweed is concentrated in the northwest prairie remnants, the Kankakee sand country and southern oak-hickory woodland edges. Poke and fourleaf milkweed occupy the state’s shaded slopes where common milkweed cannot compete.", "url": "https://milkweedusa.com/states/indiana/", "markdown": "https://milkweedusa.com/states/indiana/index.md" }, { "code": "OH", "name": "Ohio", "region": "Midwest", "usdaZones": "5b–6b", "monarchFlyway": "eastern", "speciesCount": 12, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true } ], "note": "Ohio’s old fields and reclaimed strip mines carry heavy common milkweed, while the Oak Openings region near Toledo holds unusual sand-prairie species. Lake Erie’s southern shore is a nationally important fall monarch staging area.", "url": "https://milkweedusa.com/states/ohio/", "markdown": "https://milkweedusa.com/states/ohio/index.md" }, { "code": "PA", "name": "Pennsylvania", "region": "Northeast", "usdaZones": "5a–7b", "monarchFlyway": "eastern", "speciesCount": 11, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true } ], "note": "From the Allegheny Plateau to the Piedmont, Pennsylvania supports common, swamp, butterfly and poke milkweed, with purple milkweed clinging on in scattered woodland-edge sites. Powerline rights of way managed as meadow are among the state’s best monarch habitat.", "url": "https://milkweedusa.com/states/pennsylvania/", "markdown": "https://milkweedusa.com/states/pennsylvania/index.md" }, { "code": "NJ", "name": "New Jersey", "region": "Northeast", "usdaZones": "6a–7b", "monarchFlyway": "eastern", "speciesCount": 13, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true } ], "note": "New Jersey’s Pine Barrens support sand specialists such as clasping and fewflower milkweed, while the Delaware Bayshore and Cape May peninsula funnel one of the densest fall monarch migrations on the continent. Cape May’s monarch monitoring project has run since 1990.", "url": "https://milkweedusa.com/states/new-jersey/", "markdown": "https://milkweedusa.com/states/new-jersey/index.md" }, { "code": "CT", "name": "Connecticut", "region": "Northeast", "usdaZones": "5b–7a", "monarchFlyway": "eastern", "speciesCount": 11, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true } ], "note": "Connecticut’s milkweed is largely a story of old fields and utility corridors, with swamp milkweed along the Connecticut River floodplain and butterfly weed on dry traprock ridges. Purple and red milkweed are both state-listed rarities here.", "url": "https://milkweedusa.com/states/connecticut/", "markdown": "https://milkweedusa.com/states/connecticut/index.md" }, { "code": "CA", "name": "California", "region": "Pacific", "usdaZones": "5a–11a", "monarchFlyway": "western", "speciesCount": 14, "species": [ { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "narrowleaf-milkweed", "scientificName": "Asclepias fascicularis", "commonName": "Narrowleaf Milkweed", "native": true }, { "slug": "pallid-milkweed", "scientificName": "Asclepias cryptoceras", "commonName": "Pallid Milkweed", "native": true }, { "slug": "california-milkweed", "scientificName": "Asclepias californica", "commonName": "California Milkweed", "native": true }, { "slug": "woollypod-milkweed", "scientificName": "Asclepias eriocarpa", "commonName": "Woollypod Milkweed", "native": true }, { "slug": "heartleaf-milkweed", "scientificName": "Asclepias cordifolia", "commonName": "Heartleaf Milkweed", "native": true }, { "slug": "woolly-milkweed-vestita", "scientificName": "Asclepias vestita", "commonName": "Woolly Milkweed", "native": true }, { "slug": "desert-milkweed", "scientificName": "Asclepias erosa", "commonName": "Desert Milkweed", "native": true }, { "slug": "rush-milkweed", "scientificName": "Asclepias subulata", "commonName": "Rush Milkweed", "native": true }, { "slug": "whitestem-milkweed", "scientificName": "Asclepias albicans", "commonName": "Whitestem Milkweed", "native": true }, { "slug": "serpentine-milkweed", "scientificName": "Asclepias solanoana", "commonName": "Serpentine Milkweed", "native": true }, { "slug": "balloon-plant", "scientificName": "Gomphocarpus physocarpus", "commonName": "Balloon Plant", "native": false }, { "slug": "giant-milkweed", "scientificName": "Calotropis procera", "commonName": "Giant Milkweed", "native": false } ], "note": "California holds more milkweed species than any other western state: narrowleaf in the Central Valley, heartleaf and California milkweed in the foothills, desert and rush milkweed in the south. Its coastal groves host the entire overwintering western monarch population. Tropical milkweed is a serious problem here and should not be planted.", "url": "https://milkweedusa.com/states/california/", "markdown": "https://milkweedusa.com/states/california/index.md" }, { "code": "UT", "name": "Utah", "region": "Mountain West", "usdaZones": "4a–9a", "monarchFlyway": "western", "speciesCount": 18, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "narrowleaf-milkweed", "scientificName": "Asclepias fascicularis", "commonName": "Narrowleaf Milkweed", "native": true }, { "slug": "antelope-horns", "scientificName": "Asclepias asperula", "commonName": "Antelope Horns", "native": true }, { "slug": "poison-milkweed", "scientificName": "Asclepias subverticillata", "commonName": "Poison Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "broadleaf-milkweed", "scientificName": "Asclepias latifolia", "commonName": "Broadleaf Milkweed", "native": true }, { "slug": "halls-milkweed", "scientificName": "Asclepias hallii", "commonName": "Hall’s Milkweed", "native": true }, { "slug": "pallid-milkweed", "scientificName": "Asclepias cryptoceras", "commonName": "Pallid Milkweed", "native": true }, { "slug": "dwarf-milkweed", "scientificName": "Asclepias involucrata", "commonName": "Dwarf Milkweed", "native": true }, { "slug": "sand-milkweed", "scientificName": "Asclepias arenaria", "commonName": "Sand Milkweed", "native": true }, { "slug": "wheel-milkweed", "scientificName": "Asclepias uncialis", "commonName": "Wheel Milkweed", "native": true }, { "slug": "desert-milkweed", "scientificName": "Asclepias erosa", "commonName": "Desert Milkweed", "native": true }, { "slug": "rush-milkweed", "scientificName": "Asclepias subulata", "commonName": "Rush Milkweed", "native": true }, { "slug": "mojave-milkweed", "scientificName": "Asclepias nyctaginifolia", "commonName": "Mojave Milkweed", "native": true }, { "slug": "welshs-milkweed", "scientificName": "Asclepias welshii", "commonName": "Welsh’s Milkweed", "native": true }, { "slug": "ruths-milkweed", "scientificName": "Asclepias ruthiae", "commonName": "Ruth’s Milkweed", "native": true } ], "note": "Showy milkweed along the Wasatch Front’s streams and irrigation ditches carries most of Utah’s monarch breeding, with Hall’s, broadleaf and pallid milkweed on the Colorado Plateau’s drier ground. Utah is also home to federally threatened Welsh’s milkweed in the Coral Pink Sand Dunes.", "url": "https://milkweedusa.com/states/utah/", "markdown": "https://milkweedusa.com/states/utah/index.md" }, { "code": "CO", "name": "Colorado", "region": "Mountain West", "usdaZones": "3a–7a", "monarchFlyway": "both", "speciesCount": 19, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "antelope-horns", "scientificName": "Asclepias asperula", "commonName": "Antelope Horns", "native": true }, { "slug": "poison-milkweed", "scientificName": "Asclepias subverticillata", "commonName": "Poison Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "plains-milkweed", "scientificName": "Asclepias pumila", "commonName": "Plains Milkweed", "native": true }, { "slug": "broadleaf-milkweed", "scientificName": "Asclepias latifolia", "commonName": "Broadleaf Milkweed", "native": true }, { "slug": "engelmanns-milkweed", "scientificName": "Asclepias engelmanniana", "commonName": "Engelmann’s Milkweed", "native": true }, { "slug": "halls-milkweed", "scientificName": "Asclepias hallii", "commonName": "Hall’s Milkweed", "native": true }, { "slug": "pallid-milkweed", "scientificName": "Asclepias cryptoceras", "commonName": "Pallid Milkweed", "native": true }, { "slug": "dwarf-milkweed", "scientificName": "Asclepias involucrata", "commonName": "Dwarf Milkweed", "native": true }, { "slug": "sand-milkweed", "scientificName": "Asclepias arenaria", "commonName": "Sand Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "longhood-milkweed", "scientificName": "Asclepias macrotis", "commonName": "Longhood Milkweed", "native": true }, { "slug": "wheel-milkweed", "scientificName": "Asclepias uncialis", "commonName": "Wheel Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true } ], "note": "Colorado is one of the most milkweed-diverse states in the West, with roughly twenty species spanning shortgrass plains, foothills, mesas and the Western Slope. Showy milkweed along the South Platte and Arkansas river corridors does most of the monarch work, while the eastern plains hold rarities such as wheel milkweed found almost nowhere else.", "url": "https://milkweedusa.com/states/colorado/", "markdown": "https://milkweedusa.com/states/colorado/index.md" }, { "code": "NE", "name": "Nebraska", "region": "Great Plains", "usdaZones": "4a–6a", "monarchFlyway": "eastern", "speciesCount": 20, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "antelope-horns", "scientificName": "Asclepias asperula", "commonName": "Antelope Horns", "native": true }, { "slug": "poison-milkweed", "scientificName": "Asclepias subverticillata", "commonName": "Poison Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "plains-milkweed", "scientificName": "Asclepias pumila", "commonName": "Plains Milkweed", "native": true }, { "slug": "broadleaf-milkweed", "scientificName": "Asclepias latifolia", "commonName": "Broadleaf Milkweed", "native": true }, { "slug": "engelmanns-milkweed", "scientificName": "Asclepias engelmanniana", "commonName": "Engelmann’s Milkweed", "native": true }, { "slug": "sand-milkweed", "scientificName": "Asclepias arenaria", "commonName": "Sand Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "ovalleaf-milkweed", "scientificName": "Asclepias ovalifolia", "commonName": "Oval-leaf Milkweed", "native": true }, { "slug": "woolly-milkweed", "scientificName": "Asclepias lanuginosa", "commonName": "Woolly Milkweed", "native": true } ], "note": "The Nebraska Sandhills are one of the largest intact grasslands in North America and hold sand, plains and green comet milkweed alongside abundant common and showy milkweed. The Platte River corridor is a continentally significant migration route.", "url": "https://milkweedusa.com/states/nebraska/", "markdown": "https://milkweedusa.com/states/nebraska/index.md" }, { "code": "MO", "name": "Missouri", "region": "Midwest", "usdaZones": "5b–7a", "monarchFlyway": "eastern", "speciesCount": 17, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "meads-milkweed", "scientificName": "Asclepias meadii", "commonName": "Mead’s Milkweed", "native": true }, { "slug": "woolly-milkweed", "scientificName": "Asclepias lanuginosa", "commonName": "Woolly Milkweed", "native": true } ], "note": "Missouri’s glades, Ozark woodlands and prairie remnants give it exceptional milkweed diversity for a Midwestern state, including green antelopehorn, purple milkweed and federally threatened Mead’s milkweed. Kansas City and St Louis both run large-scale urban monarch habitat programs.", "url": "https://milkweedusa.com/states/missouri/", "markdown": "https://milkweedusa.com/states/missouri/index.md" }, { "code": "KY", "name": "Kentucky", "region": "Southeast", "usdaZones": "6a–7a", "monarchFlyway": "eastern", "speciesCount": 15, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true } ], "note": "Kentucky’s Bluegrass pastures, Pennyroyal barrens and Appalachian woodland edges support common, butterfly, purple and white milkweed. The state’s remnant limestone glades are the best place to find green comet and clasping milkweed.", "url": "https://milkweedusa.com/states/kentucky/", "markdown": "https://milkweedusa.com/states/kentucky/index.md" }, { "code": "WV", "name": "West Virginia", "region": "Southeast", "usdaZones": "5a–7a", "monarchFlyway": "eastern", "speciesCount": 10, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true } ], "note": "Steep and heavily forested, West Virginia’s milkweed lives on reclaimed mine land, ridgetop pasture and woodland edge. Poke, fourleaf and white milkweed are all genuinely at home in the state’s Appalachian forests.", "url": "https://milkweedusa.com/states/west-virginia/", "markdown": "https://milkweedusa.com/states/west-virginia/index.md" }, { "code": "VA", "name": "Virginia", "region": "Southeast", "usdaZones": "5a–8a", "monarchFlyway": "eastern", "speciesCount": 14, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true } ], "note": "Virginia spans Coastal Plain sand, Piedmont clay and Appalachian ridge, and its milkweed flora follows suit: fewflower and longleaf milkweed near the coast, white and fourleaf milkweed in the mountains, common milkweed throughout. Purple and red milkweed are both state rarities.", "url": "https://milkweedusa.com/states/virginia/", "markdown": "https://milkweedusa.com/states/virginia/index.md" }, { "code": "MD", "name": "Maryland", "region": "Southeast", "usdaZones": "5b–8a", "monarchFlyway": "eastern", "speciesCount": 13, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true } ], "note": "From the Eastern Shore’s marshes to the western mountains, Maryland packs a lot of habitat into a small area, with swamp and fewflower milkweed in tidal wetlands and butterfly weed on Piedmont serpentine barrens. The serpentine grasslands of Soldiers Delight are a regional milkweed hotspot.", "url": "https://milkweedusa.com/states/maryland/", "markdown": "https://milkweedusa.com/states/maryland/index.md" }, { "code": "DE", "name": "Delaware", "region": "Northeast", "usdaZones": "7a–7b", "monarchFlyway": "eastern", "speciesCount": 13, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true } ], "note": "Delaware’s coastal plain sands and tidal marshes support clasping, fewflower and swamp milkweed, and the Delaware Bayshore is a major fall monarch staging area. Nearly the whole state is within a few feet of sea level, so wetland species dominate.", "url": "https://milkweedusa.com/states/delaware/", "markdown": "https://milkweedusa.com/states/delaware/index.md" }, { "code": "AZ", "name": "Arizona", "region": "Southwest", "usdaZones": "4b–10b", "monarchFlyway": "western", "speciesCount": 31, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "narrowleaf-milkweed", "scientificName": "Asclepias fascicularis", "commonName": "Narrowleaf Milkweed", "native": true }, { "slug": "antelope-horns", "scientificName": "Asclepias asperula", "commonName": "Antelope Horns", "native": true }, { "slug": "poison-milkweed", "scientificName": "Asclepias subverticillata", "commonName": "Poison Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "broadleaf-milkweed", "scientificName": "Asclepias latifolia", "commonName": "Broadleaf Milkweed", "native": true }, { "slug": "halls-milkweed", "scientificName": "Asclepias hallii", "commonName": "Hall’s Milkweed", "native": true }, { "slug": "pallid-milkweed", "scientificName": "Asclepias cryptoceras", "commonName": "Pallid Milkweed", "native": true }, { "slug": "dwarf-milkweed", "scientificName": "Asclepias involucrata", "commonName": "Dwarf Milkweed", "native": true }, { "slug": "sand-milkweed", "scientificName": "Asclepias arenaria", "commonName": "Sand Milkweed", "native": true }, { "slug": "longhood-milkweed", "scientificName": "Asclepias macrotis", "commonName": "Longhood Milkweed", "native": true }, { "slug": "wheel-milkweed", "scientificName": "Asclepias uncialis", "commonName": "Wheel Milkweed", "native": true }, { "slug": "desert-milkweed", "scientificName": "Asclepias erosa", "commonName": "Desert Milkweed", "native": true }, { "slug": "rush-milkweed", "scientificName": "Asclepias subulata", "commonName": "Rush Milkweed", "native": true }, { "slug": "pineneedle-milkweed", "scientificName": "Asclepias linaria", "commonName": "Pineneedle Milkweed", "native": true }, { "slug": "zizotes-milkweed", "scientificName": "Asclepias oenotheroides", "commonName": "Zizotes Milkweed", "native": true }, { "slug": "bract-milkweed", "scientificName": "Asclepias brachystephana", "commonName": "Bract Milkweed", "native": true }, { "slug": "mojave-milkweed", "scientificName": "Asclepias nyctaginifolia", "commonName": "Mojave Milkweed", "native": true }, { "slug": "whitestem-milkweed", "scientificName": "Asclepias albicans", "commonName": "Whitestem Milkweed", "native": true }, { "slug": "welshs-milkweed", "scientificName": "Asclepias welshii", "commonName": "Welsh’s Milkweed", "native": true }, { "slug": "ruths-milkweed", "scientificName": "Asclepias ruthiae", "commonName": "Ruth’s Milkweed", "native": true }, { "slug": "rusbys-milkweed", "scientificName": "Asclepias rusbyi", "commonName": "Rusby’s Milkweed", "native": true }, { "slug": "lemmons-milkweed", "scientificName": "Asclepias lemmonii", "commonName": "Lemmon’s Milkweed", "native": true }, { "slug": "mahogany-milkweed", "scientificName": "Asclepias hypoleuca", "commonName": "Mahogany Milkweed", "native": true }, { "slug": "nodding-milkweed", "scientificName": "Asclepias glaucescens", "commonName": "Nodding Milkweed", "native": true }, { "slug": "slimpod-milkweed", "scientificName": "Asclepias quinquedentata", "commonName": "Slimpod Milkweed", "native": true }, { "slug": "tufted-milkweed", "scientificName": "Asclepias nummularia", "commonName": "Tufted Milkweed", "native": true }, { "slug": "giant-milkweed", "scientificName": "Calotropis procera", "commonName": "Giant Milkweed", "native": false } ], "note": "Arizona’s milkweed flora is the most distinctive in the country, with leafless rush milkweed and towering whitestem milkweed in the Sonoran Desert, pineneedle milkweed on desert grassland, and showy milkweed along mountain streams. Many species bloom in winter or after summer monsoon rain rather than in spring.", "url": "https://milkweedusa.com/states/arizona/", "markdown": "https://milkweedusa.com/states/arizona/index.md" }, { "code": "NM", "name": "New Mexico", "region": "Southwest", "usdaZones": "4a–9a", "monarchFlyway": "both", "speciesCount": 29, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "antelope-horns", "scientificName": "Asclepias asperula", "commonName": "Antelope Horns", "native": true }, { "slug": "poison-milkweed", "scientificName": "Asclepias subverticillata", "commonName": "Poison Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "plains-milkweed", "scientificName": "Asclepias pumila", "commonName": "Plains Milkweed", "native": true }, { "slug": "broadleaf-milkweed", "scientificName": "Asclepias latifolia", "commonName": "Broadleaf Milkweed", "native": true }, { "slug": "engelmanns-milkweed", "scientificName": "Asclepias engelmanniana", "commonName": "Engelmann’s Milkweed", "native": true }, { "slug": "halls-milkweed", "scientificName": "Asclepias hallii", "commonName": "Hall’s Milkweed", "native": true }, { "slug": "pallid-milkweed", "scientificName": "Asclepias cryptoceras", "commonName": "Pallid Milkweed", "native": true }, { "slug": "dwarf-milkweed", "scientificName": "Asclepias involucrata", "commonName": "Dwarf Milkweed", "native": true }, { "slug": "sand-milkweed", "scientificName": "Asclepias arenaria", "commonName": "Sand Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "longhood-milkweed", "scientificName": "Asclepias macrotis", "commonName": "Longhood Milkweed", "native": true }, { "slug": "wheel-milkweed", "scientificName": "Asclepias uncialis", "commonName": "Wheel Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "pineneedle-milkweed", "scientificName": "Asclepias linaria", "commonName": "Pineneedle Milkweed", "native": true }, { "slug": "zizotes-milkweed", "scientificName": "Asclepias oenotheroides", "commonName": "Zizotes Milkweed", "native": true }, { "slug": "bract-milkweed", "scientificName": "Asclepias brachystephana", "commonName": "Bract Milkweed", "native": true }, { "slug": "texas-milkweed", "scientificName": "Asclepias texana", "commonName": "Texas Milkweed", "native": true }, { "slug": "mojave-milkweed", "scientificName": "Asclepias nyctaginifolia", "commonName": "Mojave Milkweed", "native": true }, { "slug": "rusbys-milkweed", "scientificName": "Asclepias rusbyi", "commonName": "Rusby’s Milkweed", "native": true }, { "slug": "lemmons-milkweed", "scientificName": "Asclepias lemmonii", "commonName": "Lemmon’s Milkweed", "native": true }, { "slug": "mahogany-milkweed", "scientificName": "Asclepias hypoleuca", "commonName": "Mahogany Milkweed", "native": true }, { "slug": "nodding-milkweed", "scientificName": "Asclepias glaucescens", "commonName": "Nodding Milkweed", "native": true }, { "slug": "slimpod-milkweed", "scientificName": "Asclepias quinquedentata", "commonName": "Slimpod Milkweed", "native": true }, { "slug": "emorys-milkweed", "scientificName": "Asclepias emoryi", "commonName": "Emory’s Milkweed", "native": true } ], "note": "New Mexico may hold more milkweed species than any other state, with antelope horns and broadleaf milkweed on the plains, pineneedle and bract milkweed in the Chihuahuan Desert, and showy milkweed along the Rio Grande. The state sits on the boundary between eastern and western monarch flyways.", "url": "https://milkweedusa.com/states/new-mexico/", "markdown": "https://milkweedusa.com/states/new-mexico/index.md" }, { "code": "KS", "name": "Kansas", "region": "Great Plains", "usdaZones": "5a–7a", "monarchFlyway": "eastern", "speciesCount": 24, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "antelope-horns", "scientificName": "Asclepias asperula", "commonName": "Antelope Horns", "native": true }, { "slug": "poison-milkweed", "scientificName": "Asclepias subverticillata", "commonName": "Poison Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "plains-milkweed", "scientificName": "Asclepias pumila", "commonName": "Plains Milkweed", "native": true }, { "slug": "broadleaf-milkweed", "scientificName": "Asclepias latifolia", "commonName": "Broadleaf Milkweed", "native": true }, { "slug": "engelmanns-milkweed", "scientificName": "Asclepias engelmanniana", "commonName": "Engelmann’s Milkweed", "native": true }, { "slug": "dwarf-milkweed", "scientificName": "Asclepias involucrata", "commonName": "Dwarf Milkweed", "native": true }, { "slug": "sand-milkweed", "scientificName": "Asclepias arenaria", "commonName": "Sand Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "wheel-milkweed", "scientificName": "Asclepias uncialis", "commonName": "Wheel Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "meads-milkweed", "scientificName": "Asclepias meadii", "commonName": "Mead’s Milkweed", "native": true }, { "slug": "woolly-milkweed", "scientificName": "Asclepias lanuginosa", "commonName": "Woolly Milkweed", "native": true }, { "slug": "zizotes-milkweed", "scientificName": "Asclepias oenotheroides", "commonName": "Zizotes Milkweed", "native": true } ], "note": "Kansas is the crossroads of the central monarch flyway, and the Flint Hills hold the largest intact tallgrass prairie left on earth. Green antelopehorn, common, showy and Mead’s milkweed all occur, and fall migration through the state is spectacular.", "url": "https://milkweedusa.com/states/kansas/", "markdown": "https://milkweedusa.com/states/kansas/index.md" }, { "code": "AR", "name": "Arkansas", "region": "Southeast", "usdaZones": "6a–8b", "monarchFlyway": "eastern", "speciesCount": 14, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true } ], "note": "The Ozark and Ouachita highlands give Arkansas dry glade species such as green antelopehorn and purple milkweed, while the Delta’s bottomland forests hold aquatic milkweed. Roadside and utility corridor management drives most monarch habitat in the state.", "url": "https://milkweedusa.com/states/arkansas/", "markdown": "https://milkweedusa.com/states/arkansas/index.md" }, { "code": "TN", "name": "Tennessee", "region": "Southeast", "usdaZones": "5b–8a", "monarchFlyway": "eastern", "speciesCount": 14, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true } ], "note": "Tennessee runs from the Mississippi bottomlands to the Great Smoky Mountains, and its cedar glades in the Central Basin are a nationally important habitat holding green antelopehorn and green comet milkweed. White and fourleaf milkweed occupy the eastern woodlands.", "url": "https://milkweedusa.com/states/tennessee/", "markdown": "https://milkweedusa.com/states/tennessee/index.md" }, { "code": "NC", "name": "North Carolina", "region": "Southeast", "usdaZones": "5b–8b", "monarchFlyway": "eastern", "speciesCount": 19, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "pinewoods-milkweed", "scientificName": "Asclepias humistrata", "commonName": "Pinewoods Milkweed", "native": true }, { "slug": "michauxs-milkweed", "scientificName": "Asclepias michauxii", "commonName": "Michaux’s Milkweed", "native": true }, { "slug": "largeflower-milkweed", "scientificName": "Asclepias connivens", "commonName": "Largeflower Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "carolina-milkweed", "scientificName": "Asclepias cinerea", "commonName": "Carolina Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true } ], "note": "North Carolina’s longleaf pine savannas hold specialist milkweeds, among them Carolina, largeflower, Michaux’s and fewflower, that occur almost nowhere else, while the mountains support poke and white milkweed. Prescribed fire is essential to keeping these coastal plain species alive.", "url": "https://milkweedusa.com/states/north-carolina/", "markdown": "https://milkweedusa.com/states/north-carolina/index.md" }, { "code": "SC", "name": "South Carolina", "region": "Southeast", "usdaZones": "7a–9a", "monarchFlyway": "eastern", "speciesCount": 23, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "pinewoods-milkweed", "scientificName": "Asclepias humistrata", "commonName": "Pinewoods Milkweed", "native": true }, { "slug": "velvetleaf-milkweed", "scientificName": "Asclepias tomentosa", "commonName": "Velvetleaf Milkweed", "native": true }, { "slug": "michauxs-milkweed", "scientificName": "Asclepias michauxii", "commonName": "Michaux’s Milkweed", "native": true }, { "slug": "pineland-milkweed", "scientificName": "Asclepias obovata", "commonName": "Pineland Milkweed", "native": true }, { "slug": "largeflower-milkweed", "scientificName": "Asclepias connivens", "commonName": "Largeflower Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "carolina-milkweed", "scientificName": "Asclepias cinerea", "commonName": "Carolina Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true }, { "slug": "balloon-plant", "scientificName": "Gomphocarpus physocarpus", "commonName": "Balloon Plant", "native": false } ], "note": "The Carolina sandhills and coastal plain savannas give South Carolina an unusual concentration of rare milkweeds, including Carolina, pinewoods, largeflower and velvetleaf milkweed. Most depend on regular burning of open pine woodland.", "url": "https://milkweedusa.com/states/south-carolina/", "markdown": "https://milkweedusa.com/states/south-carolina/index.md" }, { "code": "DC", "name": "District of Columbia", "region": "Northeast", "usdaZones": "7a–8a", "monarchFlyway": "eastern", "speciesCount": 9, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true } ], "note": "The District’s milkweed lives in Rock Creek Park, the Anacostia wetlands and a growing network of pollinator gardens on federal land. Common, swamp and butterfly milkweed all persist, and the city’s pollinator habitat commitments have added considerable planted acreage.", "url": "https://milkweedusa.com/states/district-of-columbia/", "markdown": "https://milkweedusa.com/states/district-of-columbia/index.md" }, { "code": "TX", "name": "Texas", "region": "Southwest", "usdaZones": "6a–10a", "monarchFlyway": "both", "speciesCount": 35, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "antelope-horns", "scientificName": "Asclepias asperula", "commonName": "Antelope Horns", "native": true }, { "slug": "poison-milkweed", "scientificName": "Asclepias subverticillata", "commonName": "Poison Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "plains-milkweed", "scientificName": "Asclepias pumila", "commonName": "Plains Milkweed", "native": true }, { "slug": "broadleaf-milkweed", "scientificName": "Asclepias latifolia", "commonName": "Broadleaf Milkweed", "native": true }, { "slug": "engelmanns-milkweed", "scientificName": "Asclepias engelmanniana", "commonName": "Engelmann’s Milkweed", "native": true }, { "slug": "dwarf-milkweed", "scientificName": "Asclepias involucrata", "commonName": "Dwarf Milkweed", "native": true }, { "slug": "sand-milkweed", "scientificName": "Asclepias arenaria", "commonName": "Sand Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "longhood-milkweed", "scientificName": "Asclepias macrotis", "commonName": "Longhood Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "pineland-milkweed", "scientificName": "Asclepias obovata", "commonName": "Pineland Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "pineneedle-milkweed", "scientificName": "Asclepias linaria", "commonName": "Pineneedle Milkweed", "native": true }, { "slug": "zizotes-milkweed", "scientificName": "Asclepias oenotheroides", "commonName": "Zizotes Milkweed", "native": true }, { "slug": "bract-milkweed", "scientificName": "Asclepias brachystephana", "commonName": "Bract Milkweed", "native": true }, { "slug": "texas-milkweed", "scientificName": "Asclepias texana", "commonName": "Texas Milkweed", "native": true }, { "slug": "emorys-milkweed", "scientificName": "Asclepias emoryi", "commonName": "Emory’s Milkweed", "native": true }, { "slug": "prostrate-milkweed", "scientificName": "Asclepias prostrata", "commonName": "Prostrate Milkweed", "native": true }, { "slug": "sperrys-milkweed", "scientificName": "Asclepias sperryi", "commonName": "Sperry’s Milkweed", "native": true }, { "slug": "balloon-plant", "scientificName": "Gomphocarpus physocarpus", "commonName": "Balloon Plant", "native": false }, { "slug": "giant-milkweed", "scientificName": "Calotropis procera", "commonName": "Giant Milkweed", "native": false } ], "note": "Every monarch heading north from Mexico crosses Texas, which puts its spring-blooming milkweeds, antelope horns, green antelopehorn and zizotes, among the most consequential plants on the continent. The state also holds desert, Hill Country and coastal marsh species, more than thirty in total.", "url": "https://milkweedusa.com/states/texas/", "markdown": "https://milkweedusa.com/states/texas/index.md" }, { "code": "OK", "name": "Oklahoma", "region": "Great Plains", "usdaZones": "6a–8a", "monarchFlyway": "eastern", "speciesCount": 23, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "showy-milkweed", "scientificName": "Asclepias speciosa", "commonName": "Showy Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "antelope-horns", "scientificName": "Asclepias asperula", "commonName": "Antelope Horns", "native": true }, { "slug": "poison-milkweed", "scientificName": "Asclepias subverticillata", "commonName": "Poison Milkweed", "native": true }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "plains-milkweed", "scientificName": "Asclepias pumila", "commonName": "Plains Milkweed", "native": true }, { "slug": "broadleaf-milkweed", "scientificName": "Asclepias latifolia", "commonName": "Broadleaf Milkweed", "native": true }, { "slug": "engelmanns-milkweed", "scientificName": "Asclepias engelmanniana", "commonName": "Engelmann’s Milkweed", "native": true }, { "slug": "dwarf-milkweed", "scientificName": "Asclepias involucrata", "commonName": "Dwarf Milkweed", "native": true }, { "slug": "sand-milkweed", "scientificName": "Asclepias arenaria", "commonName": "Sand Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "prairie-milkweed", "scientificName": "Asclepias sullivantii", "commonName": "Prairie Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "zizotes-milkweed", "scientificName": "Asclepias oenotheroides", "commonName": "Zizotes Milkweed", "native": true } ], "note": "Oklahoma sits squarely in the central flyway funnel, with green antelopehorn and antelope horns on the prairies, sand milkweed in the dune country and swamp milkweed along the eastern rivers. The state is a spring and fall bottleneck for the whole eastern population.", "url": "https://milkweedusa.com/states/oklahoma/", "markdown": "https://milkweedusa.com/states/oklahoma/index.md" }, { "code": "LA", "name": "Louisiana", "region": "Southeast", "usdaZones": "8a–10a", "monarchFlyway": "eastern", "speciesCount": 19, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "slimleaf-milkweed", "scientificName": "Asclepias stenophylla", "commonName": "Slimleaf Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "pinewoods-milkweed", "scientificName": "Asclepias humistrata", "commonName": "Pinewoods Milkweed", "native": true }, { "slug": "pineland-milkweed", "scientificName": "Asclepias obovata", "commonName": "Pineland Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "balloon-plant", "scientificName": "Gomphocarpus physocarpus", "commonName": "Balloon Plant", "native": false } ], "note": "Louisiana’s bottomland hardwood forests and cypress swamps support aquatic milkweed, one of the few species that grows in standing water and shade. The state is also a first landfall for monarchs crossing the Gulf, making fall nectar supply critical.", "url": "https://milkweedusa.com/states/louisiana/", "markdown": "https://milkweedusa.com/states/louisiana/index.md" }, { "code": "MS", "name": "Mississippi", "region": "Southeast", "usdaZones": "7b–9a", "monarchFlyway": "eastern", "speciesCount": 20, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "pinewoods-milkweed", "scientificName": "Asclepias humistrata", "commonName": "Pinewoods Milkweed", "native": true }, { "slug": "pineland-milkweed", "scientificName": "Asclepias obovata", "commonName": "Pineland Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "carolina-milkweed", "scientificName": "Asclepias cinerea", "commonName": "Carolina Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "balloon-plant", "scientificName": "Gomphocarpus physocarpus", "commonName": "Balloon Plant", "native": false } ], "note": "From the Delta to the Gulf coast, Mississippi holds aquatic, pinewoods and longleaf milkweed in wet savanna and sandhill habitats. The state’s remaining longleaf pine ecosystems are the stronghold for its rarer species.", "url": "https://milkweedusa.com/states/mississippi/", "markdown": "https://milkweedusa.com/states/mississippi/index.md" }, { "code": "AL", "name": "Alabama", "region": "Southeast", "usdaZones": "7a–9a", "monarchFlyway": "eastern", "speciesCount": 24, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "pinewoods-milkweed", "scientificName": "Asclepias humistrata", "commonName": "Pinewoods Milkweed", "native": true }, { "slug": "velvetleaf-milkweed", "scientificName": "Asclepias tomentosa", "commonName": "Velvetleaf Milkweed", "native": true }, { "slug": "michauxs-milkweed", "scientificName": "Asclepias michauxii", "commonName": "Michaux’s Milkweed", "native": true }, { "slug": "pineland-milkweed", "scientificName": "Asclepias obovata", "commonName": "Pineland Milkweed", "native": true }, { "slug": "largeflower-milkweed", "scientificName": "Asclepias connivens", "commonName": "Largeflower Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "carolina-milkweed", "scientificName": "Asclepias cinerea", "commonName": "Carolina Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true }, { "slug": "tall-green-milkweed", "scientificName": "Asclepias hirtella", "commonName": "Tall Green Milkweed", "native": true }, { "slug": "balloon-plant", "scientificName": "Gomphocarpus physocarpus", "commonName": "Balloon Plant", "native": false } ], "note": "Alabama’s range from Appalachian foothills to Gulf coast gives it one of the richest milkweed floras in the Southeast, including pinewoods, Carolina, largeflower and aquatic milkweed. Fire-maintained longleaf pine habitat holds most of the rarities.", "url": "https://milkweedusa.com/states/alabama/", "markdown": "https://milkweedusa.com/states/alabama/index.md" }, { "code": "GA", "name": "Georgia", "region": "Southeast", "usdaZones": "6a–9a", "monarchFlyway": "eastern", "speciesCount": 25, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "common-milkweed", "scientificName": "Asclepias syriaca", "commonName": "Common Milkweed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "poke-milkweed", "scientificName": "Asclepias exaltata", "commonName": "Poke Milkweed", "native": true }, { "slug": "purple-milkweed", "scientificName": "Asclepias purpurascens", "commonName": "Purple Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "fourleaf-milkweed", "scientificName": "Asclepias quadrifolia", "commonName": "Fourleaf Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "pinewoods-milkweed", "scientificName": "Asclepias humistrata", "commonName": "Pinewoods Milkweed", "native": true }, { "slug": "velvetleaf-milkweed", "scientificName": "Asclepias tomentosa", "commonName": "Velvetleaf Milkweed", "native": true }, { "slug": "michauxs-milkweed", "scientificName": "Asclepias michauxii", "commonName": "Michaux’s Milkweed", "native": true }, { "slug": "pineland-milkweed", "scientificName": "Asclepias obovata", "commonName": "Pineland Milkweed", "native": true }, { "slug": "largeflower-milkweed", "scientificName": "Asclepias connivens", "commonName": "Largeflower Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "carolina-milkweed", "scientificName": "Asclepias cinerea", "commonName": "Carolina Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true }, { "slug": "savannah-milkweed", "scientificName": "Asclepias pedicellata", "commonName": "Savannah Milkweed", "native": true }, { "slug": "southern-milkweed", "scientificName": "Asclepias viridula", "commonName": "Southern Milkweed", "native": true }, { "slug": "balloon-plant", "scientificName": "Gomphocarpus physocarpus", "commonName": "Balloon Plant", "native": false } ], "note": "Georgia’s sandhills, coastal plain savannas and Piedmont woodlands support more than a dozen milkweed species, with pinewoods milkweed feeding the earliest spring monarchs moving north through the state. Prescribed burning drives the health of most of them.", "url": "https://milkweedusa.com/states/georgia/", "markdown": "https://milkweedusa.com/states/georgia/index.md" }, { "code": "HI", "name": "Hawaii", "region": "Pacific", "usdaZones": "9a–13a", "monarchFlyway": "none", "speciesCount": 3, "species": [ { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "balloon-plant", "scientificName": "Gomphocarpus physocarpus", "commonName": "Balloon Plant", "native": false }, { "slug": "giant-milkweed", "scientificName": "Calotropis procera", "commonName": "Giant Milkweed", "native": false } ], "note": "Hawaii has no native milkweed. Monarchs arrived in the islands in the 1840s and now breed year-round on introduced tropical milkweed and balloon plant, forming a non-migratory resident population. Because they do not migrate, the usual advice about cutting back tropical milkweed does not apply in the same way here.", "url": "https://milkweedusa.com/states/hawaii/", "markdown": "https://milkweedusa.com/states/hawaii/index.md" }, { "code": "FL", "name": "Florida", "region": "Southeast", "usdaZones": "8a–11a", "monarchFlyway": "eastern", "speciesCount": 24, "species": [ { "slug": "butterfly-weed", "scientificName": "Asclepias tuberosa", "commonName": "Butterfly Weed", "native": true }, { "slug": "swamp-milkweed", "scientificName": "Asclepias incarnata", "commonName": "Swamp Milkweed", "native": true }, { "slug": "whorled-milkweed", "scientificName": "Asclepias verticillata", "commonName": "Whorled Milkweed", "native": true }, { "slug": "tropical-milkweed", "scientificName": "Asclepias curassavica", "commonName": "Tropical Milkweed", "native": false }, { "slug": "green-comet-milkweed", "scientificName": "Asclepias viridiflora", "commonName": "Green Comet Milkweed", "native": true }, { "slug": "clasping-milkweed", "scientificName": "Asclepias amplexicaulis", "commonName": "Clasping Milkweed", "native": true }, { "slug": "white-milkweed", "scientificName": "Asclepias variegata", "commonName": "White Milkweed", "native": true }, { "slug": "green-antelopehorn", "scientificName": "Asclepias viridis", "commonName": "Green Antelopehorn", "native": true }, { "slug": "aquatic-milkweed", "scientificName": "Asclepias perennis", "commonName": "Aquatic Milkweed", "native": true }, { "slug": "pinewoods-milkweed", "scientificName": "Asclepias humistrata", "commonName": "Pinewoods Milkweed", "native": true }, { "slug": "velvetleaf-milkweed", "scientificName": "Asclepias tomentosa", "commonName": "Velvetleaf Milkweed", "native": true }, { "slug": "michauxs-milkweed", "scientificName": "Asclepias michauxii", "commonName": "Michaux’s Milkweed", "native": true }, { "slug": "pineland-milkweed", "scientificName": "Asclepias obovata", "commonName": "Pineland Milkweed", "native": true }, { "slug": "largeflower-milkweed", "scientificName": "Asclepias connivens", "commonName": "Largeflower Milkweed", "native": true }, { "slug": "fewflower-milkweed", "scientificName": "Asclepias lanceolata", "commonName": "Fewflower Milkweed", "native": true }, { "slug": "red-milkweed", "scientificName": "Asclepias rubra", "commonName": "Red Milkweed", "native": true }, { "slug": "carolina-milkweed", "scientificName": "Asclepias cinerea", "commonName": "Carolina Milkweed", "native": true }, { "slug": "longleaf-milkweed", "scientificName": "Asclepias longifolia", "commonName": "Longleaf Milkweed", "native": true }, { "slug": "curtiss-milkweed", "scientificName": "Asclepias curtissii", "commonName": "Curtiss’ Milkweed", "native": true }, { "slug": "feays-milkweed", "scientificName": "Asclepias feayi", "commonName": "Feay’s Milkweed", "native": true }, { "slug": "savannah-milkweed", "scientificName": "Asclepias pedicellata", "commonName": "Savannah Milkweed", "native": true }, { "slug": "southern-milkweed", "scientificName": "Asclepias viridula", "commonName": "Southern Milkweed", "native": true }, { "slug": "balloon-plant", "scientificName": "Gomphocarpus physocarpus", "commonName": "Balloon Plant", "native": false }, { "slug": "giant-milkweed", "scientificName": "Calotropis procera", "commonName": "Giant Milkweed", "native": false } ], "note": "Florida holds a resident non-migratory monarch population in the south alongside migrants passing through the panhandle, and its native flora includes aquatic, pinewoods, largeflower and velvetleaf milkweed. Tropical milkweed is the state’s biggest monarch conservation problem, because it never dies back and OE parasite loads build to damaging levels.", "url": "https://milkweedusa.com/states/florida/", "markdown": "https://milkweedusa.com/states/florida/index.md" } ] }