Swamp Milkweed

Asclepias incarnata subsp. var.	Swamp Milkweed, Rose Milkweed, Swamp Silkweed, White Indian Hemp
	Habit: herbaceous Height: ⇕ to Width: ⇔ to 1m 1.5m Height: ⇕ warning.png"" cannot be used as a page name in this wiki. to 1 m Width: ⇔ warning.png"" cannot be used as a page name in this wiki. to 1.5 m Lifespan: ⌛ Origin: ✈ Poisonous: ☠ Bloom: ❀ early summer, mid summer	Exposure: ☼ Water: ◍ Features: ✓ Hidden fields, interally pass variables to right place Minimum Temp: ☃ °Fwarning.png"°F" is not a number. USDA Zones: to Sunset Zones: Flower features: ❀ pink, white
	Apocynaceae > Asclepias incarnata var. ,

Asclepias incarnata, with common names such as: Swamp Milkweed', is a herbaceous, perennial plant species native to North America. It is found growing in damp to wet soils and also is cultivated as a garden plant for its attractive flowers, which are visited by butterflies and other pollinators due to its copious production of nectar. Like most other milkweeds, it has sap containing toxic chemicals, a characteristic that repels insects and herbivorous animals.

Swamp milkweed is an upright, 100- to 150-centimeter (39- to 59-inches) tall plant, growing from thick, fleshy, white roots. Typically, its stems are branched and the clump forming plants emerge in late spring after most other plants have begun growth for the year. The oppositely arranged leaves are 7 to 15 centimeters (2.75 to 6 inches) long and are narrow and lance-shaped, with the ends tapering to a sharp point.

The plants bloom in early to mid-summer, producing small, fragrant, pink to mauve (sometimes white) colored flowers in rounded umbels. The flower color may vary from darker shades of purple to soft, pinkish purple and a white flowering form exists as well. The flowers have five reflexed petals and an elevated central crown. After blooming, green seed pods, approximately 12 centimeters (4.5 inches) long, are produced that when ripe, split open. They then release light to dark brown, flat seeds that are attached to silver-white silky-hairs ideal for catching the wind. This natural mechanism for seed dispersal is similar to that used by other milkweed plants.

It is one of the best attractors of the Monarch Butterfly, which feeds on the flowers and lays her eggs on the plants. The emerging caterpillars feed on the leaves.

Blooming occurs in mid to late summer and after blooming; long, relatively thin, rounded, pods are produced that grow uprightly. The pods split open in late summer to late fall, releasing seeds that are attached to silky hairs, which act as parachutes that carry the seeds on the currents of the wind.

This species is cultivated frequently and a number of cultivars are available. They are used especially in gardens designed to attract butterflies. The nectar of the plant attracts many other species of butterflies and insects as well. The plants are also sold as freshly cut flowers, mostly for their long-lasting flower display, but sometimes, for the distinctive seed pods.

Standard Cyclopedia of Horticulture

Asclepias incarnata, Linn. Glabrous or nearly so, leafy and branching, 3 ft.: Lvs. opposite, oblong-lanceolate: corolla rose-purple to flesh-color, with oblong lobes: pods glabrous, erect. B.R. 250. Var. piilchra, Pers. Hirsute, and Lvs. broader. Swamps.—Common. The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

Cultivation

Swamp milkweed prefers moisture retentive to damp soils in full sun to partial shade and typically, is found growing wild near the edges of ponds, lakes, streams, and low areas—or along ditches. The plants have specialized roots for living in heavy wet soils. The scented, thick, white roots are adapted to live in environments low in oxygen.

Gallery

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  Leaves emerging from a stalk

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  Closed seed pods

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  Open seed pods

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  Closeup of purple-pink Swamp Milkweed flowers

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  'Ice Ballet' with white flowers

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  A variety with dark-purple spotted flowers

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  Mature caterpillar of Monarch Butterfly on Swamp Milkweed

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  Sphex ichneumoneus feeding

References

• Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963

External links

• w:Swamp Milkweed. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
• Swamp Milkweed QR Code (Size 50, 100, 200, 500)