Swamp Milkweed
Asclepias incarnata
Last reviewed: June 2026
Swamp 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
part sun
Water
high
Size
24"–60" H × 12"–24" W
Bloom
Jun, Jul, Aug
Native to
AL, AR, AZ, CO and 40 more states
Pollinators
bees, butterflies, moths
Browse plants for this ecoregion
Swamp milkweed produces clusters of fragrant pink flowers from June through August on sturdy stems that reach 2-5 feet tall. This native perennial thrives in moist conditions and forms attractive clumps over time. The long seed pods that follow the flowers add interest through fall before the plant goes dormant in winter.
In an HOA neighborhood
Swamp Milkweed is an HOA-friendly choice in the right placement. Maintenance level: moderate. Tidiness: 3 out of 5.
Works well in: mid zone, backyard only.
- Requires consistently moist soil which may be difficult to maintain
- Can look weedy when dormant in winter
- May self-seed and spread beyond intended area
Wildlife value
Host plant for monarch butterfly, queen butterfly.
Essential host plant for monarch butterfly caterpillars and provides nectar for many butterflies, bees, and moths. The flowers are particularly attractive to monarchs during their summer breeding season.
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 Swamp Milkweed and shows pet-safe natives for your ecoregion instead.