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Swamp Milkweed

What is swamp milkweed?

· Sarah Mitchell

Key facts

Scientific name Asclepias incarnata[1]
Family Apocynaceae[4]
Plant type Herbaceous perennial[1]
Native range North America[1]
Habitat Swamps, marshes, bogs, stream banks[1]
Common names Rose milkweed, marsh milkweed, pink milkweed[3]

Swamp milkweed is a herbaceous perennial wildflower native to North America, known scientifically as Asclepias incarnata, that thrives in wet habitats like swamps and stream banks.

Context

Swamp milkweed (Asclepias incarnata) is a moisture-loving perennial in the milkweed family, native to North America. It grows in wetlands such as swamps, marshes, and stream banks [1]. It is often confused with common milkweed (Asclepias syriaca), but differs in habitat and flower color [2]. The plant produces pink flower clusters and serves as a host for monarch larvae [5]. Its milky sap can be toxic in large amounts [4].

Documented claims

  • Swamp milkweed is a food source for monarch butterfly larvae. [5]
  • The plant has pink flower clusters, though white flowers are rare. [5]
  • Its sap is milky latex and is toxic in large quantities. [4]

Questions and answers

Where is the best place to plant swamp milkweed?

Plant it in moist to wet soil in full sun, such as near a pond or in a rain garden. It naturally grows in swamps and stream banks [1].

Can you touch swamp milkweed?

Yes, but the milky sap may irritate skin. It is toxic if ingested in large quantities [4].

What is swamp milkweed used for?

It is primarily used in gardens to attract pollinators, especially monarch butterflies, whose larvae feed on the leaves [5].

Sources

  1. Swamp Milkweed - AquaPlant: Management of Pond Plants & Algae — aquaplant.tamu.edu (retrieved August 3, 2026)
  2. Asclepias incarnata (Marsh Milkweed, Swamp Butterfly Weed ... — plants.ces.ncsu.edu (retrieved August 3, 2026)
  3. Swamp Milkweed (Asclepias incarnata) — art.msu.edu (retrieved August 3, 2026)
  4. Swamp Milkweed (Asclepias incarnata) — wildseedproject.net (retrieved August 3, 2026)
  5. swamp milkweed Asclepias incarnata from New England Wild Flower Society — plantfinder.nativeplanttrust.org (retrieved August 3, 2026)

Sources last checked August 3, 2026. · More in Things