Poison Hemlock is a non-native biennial in the carrot family introduced from Europe, now widespread in disturbed areas, roadsides, and stream banks across North America. It is recognized by purple-spotted hollow stems and fine, fern-like leaves. The plant that killed Socrates in ancient Greece, it remains one of North America's most dangerous introduced plants.
Best time to see a Poison Hemlock
The best time to see a Poison Hemlock is April–June, when about 69% of U.S. sightings happen, based on 38,927 research-grade iNaturalist observations.
Not certain it is a Poison Hemlock? What plant is this? walks through what to check first and the lookalikes that catch people out.
Often confused with
Recent Poison Hemlock sightings near you
Live, research-grade observations from iNaturalist. Allow location to center the map on you.
Spotted a Poison Hemlock?
Point Huck at any plant, bird, or animal and know for sure - plus a live map of where it is being spotted near you.