# Milkweed in New Hampshire

> 8 milkweed species are recorded in New Hampshire.

Source: https://milkweedusa.com/states/new-hampshire/  
Licence: CC BY 4.0 (Milkweed USA)

## Overview

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.

- Species recorded: 8
- USDA hardiness zones: 3b–6a
- Monarch flyway: eastern
- Best time to sow seed outdoors: late October to early December

## Species recorded in New Hampshire

| Common name | Scientific name | Native | Height | Bloom |
| --- | --- | --- | --- | --- |
| Swamp Milkweed | Asclepias incarnata | Yes | 3 ft–5 ft | June to September |
| Butterfly Weed | Asclepias tuberosa | Yes | 1 ft–3 ft | May to September |
| Purple Milkweed | Asclepias purpurascens | Yes | 2 ft–4 ft | May to July |
| Poke Milkweed | Asclepias exaltata | Yes | 3 ft–6 ft | June to July |
| Common Milkweed | Asclepias syriaca | Yes | 3 ft–6 ft | June to August |
| Whorled Milkweed | Asclepias verticillata | Yes | 1 ft–2.5 ft | June to September |
| Clasping Milkweed | Asclepias amplexicaulis | Yes | 1.5 ft–3 ft | May to July |
| Fourleaf Milkweed | Asclepias quadrifolia | Yes | 1 ft–2 ft | May to June |

## How to cite

Milkweed USA. (2026). Milkweed in New Hampshire. https://milkweedusa.com/states/new-hampshire/