Milkweed in Massachusetts
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.
The best milkweed to plant in Massachusetts
Native to the state, garden-worthy and useful to monarchs. Start here if you are planting rather than identifying.
All milkweed species in Massachusetts
| Species | Height | Flower | Bloom | Soil | Monarch |
|---|---|---|---|---|---|
| Swamp Milkweed Asclepias incarnata |
3 ft–5 ft | pink, rose, white | June to September | Wet / Average | |
| Butterfly Weed Asclepias tuberosa |
1 ft–3 ft | orange, yellow, red | May to September | Dry / Average | |
| Purple Milkweed Asclepias purpurascens |
2 ft–4 ft | purple, magenta | May to July | Average / Dry | |
| Poke Milkweed Asclepias exaltata |
3 ft–6 ft | white, green | June to July | Average | |
| Common Milkweed Asclepias syriaca |
3 ft–6 ft | pink, mauve, white | June to August | Dry / Average | |
| Whorled Milkweed Asclepias verticillata |
1 ft–2.5 ft | white, green | June to September | Dry / Average | |
| Clasping Milkweed Asclepias amplexicaulis |
1.5 ft–3 ft | pink, green, mauve | May to July | Dry | |
| Fourleaf Milkweed Asclepias quadrifolia |
1 ft–2 ft | pink, white | May to June | Dry / Average |
Planting milkweed in Massachusetts
Sow seed outdoors in late October to early December. Winter then supplies the cold-moist stratification most milkweed seed needs, and germination happens naturally as the soil warms. If you have missed that window, chill seed in the refrigerator for 30 days and sow after your last frost. The full method is here.
Massachusetts spans USDA zones 5a–7b, so check the zone range on each species page before committing. Match the species to your site rather than the other way round: dry, sunny and poor suits butterfly weed and the whorled species; a damp spot suits swamp milkweed; shade suits very few milkweeds at all.
Plant at least ten stems in one group rather than scattering them, because female monarchs find dense patches far more readily. Add late-season nectar such as goldenrod and asters so the fall migratory generation has fuel as well as host plants. How to lay out a monarch garden.
Where to buy milkweed in Massachusetts
Start with Native Plant Trust. State native plant societies run the plant sales worth going to: locally grown, untreated stock, at a few dollars a plant, sold by people who can tell you where to put it.
Elsewhere in the northeast
Independent seed producer supplying restoration-scale native seed by the pound.
Small independent mail-order nursery for eastern natives.
Maine non-profit selling wild-type native seed and running sowing workshops.
Independent grower supplying Mid-Atlantic restoration work.
Independent Pennsylvania native plant and tree nursery.
Ships to you
One of the widest milkweed seed and bare-root ranges anywhere, with germination codes listed for every species.
Long-established independent nursery specializing in Midwestern natives.
Family-run native seed producer for the eastern and central states.
Family-run Texas seed house focused on regional ecotypes.
Independent nursery growing Missouri-provenance natives.
These favor independent nurseries and non-profits over chain garden centers, which mostly stock unlabeled tropical milkweed and often cannot tell you whether it has been treated with neonicotinoids. Search the full directory by ZIP code.
Milkweed in Massachusetts: common questions
What milkweed is native to Massachusetts?
8 milkweed species are recorded in Massachusetts, including Swamp Milkweed (Asclepias incarnata), Butterfly Weed (Asclepias tuberosa), Purple Milkweed (Asclepias purpurascens), Poke Milkweed (Asclepias exaltata). The full list is on this page.
What is the best milkweed to plant in Massachusetts?
Swamp Milkweed, Butterfly Weed, Purple Milkweed are the best combination of native, available and garden-worthy for Massachusetts. Swamp Milkweed is the easiest to start with.
When should I plant milkweed seed in Massachusetts?
Sow outdoors in late October to early December, so winter provides the cold stratification the seed needs. If you have missed that window, stratify seed in the refrigerator for 30 days and sow in spring after the last frost.
Does milkweed grow wild in Massachusetts?
Yes. 8 species occur in Massachusetts, typically on roadsides, field margins, prairie remnants and along watercourses. 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.
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Milkweed USA. (2026). Milkweed in Massachusetts. Retrieved DATE, from https://milkweedusa.com/states/massachusetts/
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Milkweed USA. "Milkweed in Massachusetts." Last modified 2026-08-01. Accessed DATE. https://milkweedusa.com/states/massachusetts/.
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url = {https://milkweedusa.com/states/massachusetts/},
note = {Accessed DATE}
}