swamp milkweed

Swamp Milkweed
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Gentianales Family: Apocynaceae Subfamily: Asclepiadoideae Genus: Asclepias Species: A. incarnata
Binomial name
Asclepias incarnata L.

Swamp Milkweed, Rose Milkweed, Swamp Silkweed and, White Indian Hemp (Asclepias incarnata) is a herbaceous plant species, related to other milkweeds.

Swamp milkweed prefers moisture retentive to damp soils in full sun to part shade and is typically found growing wild near the edges of ponds, lakes, streams and low areas or along ditches. It is one of the best attractors of the Monarch Butterfly which feeds on the flowers and lays its eggs on the plants and the caterpillars feed on the leaves. Unlike other members of the milkweed group, this species doe not have the milky sap that the others have. They have specialized roots for living in heavy wet soils, the scented, thick, white roots are adapted to live in environments low in oxygen. Plants bloom in mid to late summer and after blooming; long, relatively thin, rounded pods are produced that are upright growing. The pods split open in late summer to late fall releasing seeds that are attached to silky hairs that act as parachutes that carry the seeds on the currents of the wind.

This species is commonly cultivated, especially in gardens for attracting butterflies. The flower color can vary from darker shades of purple to soft pinkish purple, with white flowering forms existing too. A number of cultivars are available and the plants are used as fresh cut flowers, most for there long lasting flower display but sometimes also for the seed pods.

Flowers closeup

Flowers with an insect feeding on its nectar

External links

Wikiversity has bloom time data for Asclepias incarnata on the Bloom Clock

• Asclepias incarnata at Evergreen native plant database
• Swamp Milkweed page from the Natural Resources Conservation Service database

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