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.
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