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Asclepias incarnata
Also called Pleurisy Root
Swamp milkweed is a native North American perennial that grows 1 to 1.5 m tall in damp to wet soil and is grown for its pink to mauve flowers, which attract butterflies, especially monarchs. It is one of the best plants for a moist sunny garden or pond margin.
Asclepias incarnata, the swamp milkweed, rose milkweed, rose milkflower, swamp silkweed, or white Indian hemp, is a herbaceous perennial plant species native to North America. It grows in damp through wet soils and also is cultivated as a garden plant for its flowers, which attract butterflies and other pollinators with nectar. Like most other milkweeds, it has latex containing toxic steroids, a characteristic that repels many species of insects and mammals.
A. incarnata is cultivated frequently, and a number of cultivars are available. They are used especially in gardens designed to attract butterflies (see Butterfly gardening). The nectar of the plant attracts many other species of insect as well. The plants are also sold as freshly cut flowers, mostly for their long-lasting flower display, but sometimes for the distinctive follicles.
Monarch Watch provides information on rearing monarchs and their host plants. Efforts to increase monarch butterfly populations by establishing butterfly gardens and monarch migratory "waystations" require particular attention to the target species' food preferences and population cycles, as well to the conditions needed to propagate and maintain their food plants.
Swamp milkweed prefers neutral to slightly acidic soil with rich, wet, very muddy to average garden moisture and full sun or partial shade. It is most often found on the margins of flooded plains, lakes, ponds, waterways, marshes, swamps, and other wet areas. It is one of the best attractors of the monarch butterfly (Danaus plexippus), which feeds on the flowers and lays eggs on the plants. The emerging caterpillars feed on the leaves.
Cartwheels · Whitestem milkweed · Spider milkweed · California milkweed · Heartleaf milkweed · Bloodflower · Curtiss' milkweed · Woollypod milkweed · Desert milkweed · Poke milkweed · Mexican whorled milkweed · Florida milkweed
Text excerpted from the Wikipedia article Asclepias incarnata by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
