Prairie Milkweed
Asclepias sullivantii
Last reviewed: June 2026
Prairie Milkweed is toxic to dogs and cats.
Listed as toxic by the ASPCA Animal Poison Control Center (last reviewed 2026-05-21). If your pet has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435and your veterinarian's emergency line.
Pollinator Patch flags toxic plants so you can choose a pet-safe native alternative for your yard.
Light
full sun
Water
medium
Size
24"–48" H × 12"–24" W
Bloom
Jun, Jul, Aug
Native to
IA, IL, IN, KS and 9 more states
Pollinators
bees, butterflies, moths
Browse plants for this ecoregion
Prairie milkweed is a sturdy native perennial that produces clusters of pink to purple flowers from June through August. It grows 2-4 feet tall with a neat, upright habit and broad leaves that remain attractive throughout the growing season.
In an HOA neighborhood
Prairie Milkweed is an HOA-friendly choice. Maintenance level: low. Tidiness: 4 out of 5.
Works well in: front yard, foundation, street edge, mid zone.
- Goes completely dormant in winter
- May spread slowly by underground rhizomes
Wildlife value
Host plant for monarch butterfly.
This plant is essential for monarch butterflies, serving as both a host plant for caterpillars and nectar source for adults. It also attracts native bees, moths, and other beneficial insects.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Pollinator Patch flags toxic plants like Prairie Milkweed and shows pet-safe natives for your ecoregion instead.