When does prairie milkweed bloom?

Prairie milkweed typically flowers from June through August, producing rounded clusters of pink to light purple blooms.

What pollinators visit prairie milkweed?

Bees, butterflies, and moths regularly visit the flowers for nectar, and the plant is often noted as a host and nectar source in monarch conservation plantings.

What growing conditions does prairie milkweed need?

It does best in full sun with medium to consistently moist soil, and it tolerates the wetter, heavier soils found in tallgrass prairies and moist meadows better than many other milkweed species.

How can I tell prairie milkweed apart from common milkweed?

Prairie milkweed has broader, smoother, hairless leaves and slightly larger flower clusters than common milkweed, which has fuzzy leaves and stems.

Is Prairie Milkweed toxic to dogs?

Yes. Prairie Milkweed is listed as toxic to dogs by the ASPCA Animal Poison Control Center (aspca.org). If your pet has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435.

Is Prairie Milkweed toxic to cats?

Yes. Prairie Milkweed is listed as toxic to cats by the ASPCA Animal Poison Control Center (aspca.org). If your cat has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435.

Is Prairie Milkweed HOA-friendly?

Prairie Milkweed is generally an HOA-friendly choice in the right placement, with low maintenance.

Prairie Milkweed

Name: Pollinator Patch
Author: Pollinator Patch

Asclepias sullivantii

Last reviewed: September 2026

Asclepias sullivantii, or prairie milkweed, produces clusters of pink to rose colored flowers from June through August. It grows best in full sun prairies and moist meadows across the central and midwestern United States.

Prairie Milkweed (Asclepias sullivantii) — Photo: (c) Samuel A Schmid, PhD, PWS, some rights reserved (CC BY)

Prairie Milkweed is toxic to dogs and cats.

Listed as toxic by the ASPCA Animal Poison Control Center (opens in new tab) (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 8 more states

Pollinators

bees, butterflies, moths

Before you buy

Your city may pay you to plant this

Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.

Find rebates in your area

Browse plants for this ecoregion

Central Great Plains Great Plains Cross Timbers Central Irregular Plains Western Corn Belt Plains Southeastern Wisconsin Till Plains Central Corn Belt Plains Eastern Corn Belt Plains Southern Michigan/Northern Indiana Drift Plains Interior River Valleys and Hills

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.

Growing Prairie Milkweed

Grow Prairie Milkweed in full sun and medium water. Mature plants reach 24 to 48 inches tall and spread 12 to 24 inches wide. Expect low maintenance to keep it looking intentional in a front yard.

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.

Common questions

When does prairie milkweed bloom?: Prairie milkweed typically flowers from June through August, producing rounded clusters of pink to light purple blooms.
What pollinators visit prairie milkweed?: Bees, butterflies, and moths regularly visit the flowers for nectar, and the plant is often noted as a host and nectar source in monarch conservation plantings.
What growing conditions does prairie milkweed need?: It does best in full sun with medium to consistently moist soil, and it tolerates the wetter, heavier soils found in tallgrass prairies and moist meadows better than many other milkweed species.
How can I tell prairie milkweed apart from common milkweed?: Prairie milkweed has broader, smoother, hairless leaves and slightly larger flower clusters than common milkweed, which has fuzzy leaves and stems.
Is Prairie Milkweed toxic to dogs?: Yes. Prairie Milkweed is listed as toxic to dogs by the ASPCA Animal Poison Control Center (aspca.org). If your pet has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435.
Is Prairie Milkweed toxic to cats?: Yes. Prairie Milkweed is listed as toxic to cats by the ASPCA Animal Poison Control Center (aspca.org). If your cat has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435.
Is Prairie Milkweed HOA-friendly?: Prairie Milkweed is generally an HOA-friendly choice in the right placement, with low maintenance.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

See all plant problem guides

Pollinator Patch flags toxic plants like Prairie Milkweed and shows pet-safe natives for your ecoregion instead.

Find pet-safe natives

iPhone app Android app

Planning a bed around it? Start a free plan with this plant

Not sure where to start? Take the 2-minute yard quiz