Common Milkweed

Asclepias syriaca

Common Milkweed
Silkweed
Silky Swallowwort
Algodoncillo
Apocynaceae
Asclepias
Asclepias syriaca
Linnaeus
SK, MB, ON, QC, NB, NS
PE, NL
Asclepias intermedia
Asclepias kansana
Asclepias syriaca var. kansana
Characteristics
Wildflower
Deciduous
2
Sun
Clay, Sand
Normal, Moist
No
No
No
No
Habitat Considerations
Boreal Shield, Atlantic Maritime, Mixedwood Plains, Prairies
Forest Edge, Prairie/Meadow/Field
Butterfly, Prairie/Meadow
Design Considerations
50 cm
150 cm
Jun - Aug
Purple|Pink
Yes
Yes
Green
monarch butterfly
Yes
No
No
Yes
No
Butterflies, Butterfly Larvae
No
Conservation Status
No
Interesting Tidbits
POISONOUS PARTS: Milky sap from leaves, stems. Toxic only in large quantities. Symptoms include vomiting, stupor, weakness, spasms by ingesting other species; need careful identification. Toxic Principle: Resinoid, cardiac glycoside in other species. (Poisonous Plants of N.C. State) The name milkweed refers to the milky white sap, which contains bitter chemicals to protect the plants from predators. A few insects are immune to these poisons and accumulate them in their bodies, protecting themselves from their own predators. Monarch butterflies cannot complete their life cycles without milkweed. (Kershaw) Provides nectar for butterflies such as: pipe-vine swallowtail, black swallowtail, tiger swallowtail, gray hairstreak, summer azure, great spangled fritillary, aphrodite fritillary, silvery checkerspot, Baltimore, American painted lady, red admiral, little wood satyr, wood nymph. (Wildtype) Aboriginal people have used it for medicinal reasons. People have used the tough fibres for making cord and rope. (USDA Plants)

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