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Common Milkweed

What is common milkweed?

· Sarah Mitchell

Key facts

Scientific name Asclepias syriaca[2]
Family Asclepiadaceae[3]
Native range Southern Canada and much of the United States east of the Rocky Mountains[1]
Height 2 to 6 feet[1]
Other names Butterfly flower, silkweed, silky swallow-wort, Virginia silkweed[2]

Common milkweed (*Asclepias syriaca*) is a perennial wildflower native to eastern North America, known for its milky sap, pink to purplish flower clusters, and role as a host plant for monarch butterflies.

Context

Common milkweed is a perennial herb that grows in sunny areas, ditches, meadows, and disturbed sites [5]. It produces pod-shaped fruits that split open to release fluffy seeds carried by the wind [5]. The milky sap in its leaves and stems gives the plant its name [1]. As a host plant, it supports monarch butterflies, which lay eggs on it [6]. It is part of the broader milkweed group, which includes other species like swamp milkweed.

Documented claims

  • Common milkweed is a host plant for monarch butterflies. [5]
  • The plant contains cardiac glycosides and is poisonous to animals if eaten. [4]
  • Its seeds are dispersed by wind. [5]

Related

  • Swamp MilkweedSwamp milkweed is a related species that readers may want to compare.

Questions and answers

Is common milkweed good to have around?

Yes, it is beneficial because it serves as a host plant for monarch butterflies and provides nectar for other pollinators [5].

What is common milkweed good for?

It is primarily valuable for supporting monarch butterflies and other pollinators, and it has historical uses for its fibers and fluff [2].

Should I get rid of common milkweed?

It depends on your goals. While it can spread in gardens, it is important for monarch conservation, so many gardeners choose to keep it [6].

Sources

  1. Common Milkweed (Asclepias syriaca L.) — fs.usda.gov (retrieved August 3, 2026)
  2. Common milkweed | Season Watch — seasonwatch.umn.edu (retrieved August 3, 2026)
  3. Common Milkweed - Ohio Perennial and Biennial Weed Guide — weedguide.cfaes.osu.edu (retrieved August 3, 2026)
  4. Common Milkweed - Missouri Department of Conservation — mdc.mo.gov (retrieved August 3, 2026)
  5. COMMON MILKWEED — plants.sc.egov.usda.gov (retrieved August 3, 2026)
  6. Milkweed | Home Garden Education Office | College of Agriculture, Health ... — homegarden.cahnr.uconn.edu (retrieved August 3, 2026)

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