Species library · Plants & herbs

Butterfly Weed: poisonous

Asclepias tuberosa

☠ Poisonous. Do not eat.What to do if poisoning is suspected

Butterfly Weed is classed as poisonous in the Forage field guide. This page helps you identify it and tell it apart from similar species. It is not a foraging guide. When in doubt, have a find identified by an expert.

If you suspect poisoning, call your local poison control center right away. If someone has trouble breathing, has a seizure or is unconscious, call emergency services. Don't wait for symptoms: with some poisonings they only start hours later. Keep any leftovers of the find, they help identify it.

Usually seen from May to August in the northern hemisphere. Found in Grassland, Heath & moor. Can be confused with similar species.

☠ Poisonous
Butterfly Weed (Asclepias tuberosa)

Photo: (c) Michael J. Papay, some rights reserved (CC BY), uploaded by Michael J. Papay · iNaturalist

When Butterfly Weed appears

Typical window in the northern hemisphere. The southern hemisphere runs about six months offset.

Where it grows

Butterfly Weed is usually found in Grassland, Heath & moor.

Look up Butterfly Weed in the app

In the Forage app, Butterfly Weed has a full field guide entry with more photos, key features and the species it can be confused with.

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Butterfly Weed: common questions

Is Butterfly Weed poisonous?

Yes. Butterfly Weed is classed as poisonous in the Forage field guide. Do not eat it. If you suspect poisoning, call your local poison control center right away, or emergency services if it is life-threatening.

When does Butterfly Weed appear?

Butterfly Weed usually appears from May to August in temperate northern regions. The exact timing shifts with latitude, elevation and each year's weather.

Where does Butterfly Weed grow?

Butterfly Weed is usually found in Grassland, Heath & moor.

What can Butterfly Weed be confused with?

Toxic look-alikes: Common milkweed, Swamp milkweed, Tropical milkweed. Only a confident identification tells them apart. When in doubt, have a find checked by an expert.

One note before you head out

Forage helps you discover and identify wild plants, but identification is never 100% certain. Many edible plants have toxic lookalikes. Never eat anything you find based only on what this app tells you. Always confirm with a field guide, an experienced forager or a local expert. The season score tells you where to look, too: it’s not a guarantee. Mind conservation law and property rights as well.

Species photos via Wikimedia Commons and iNaturalist · full credits