Invasive Species

Poison Hemlock

Conium maculatum L. Other Common Names: Deadly hemlock, poison parsley

The purple blotches are its most distinguishing trait!

Mature plant
Mature Plant
  • Wet sites, gardens, roadsides, wastelands, pastures, and meadows.
  • In Lorain County the most frequently found stands of Poison Hemlock tend to be in areas where land has been disturbed and not reseeded with grasses or other plant material.
  • Biennial, forming a rosette the first year and producing flowers and seed in the second.
  • 2-7 feet tall, branched plant with flowers.
  • Branched, waxy with purple blotches; hollow between nodes and grooved.
  • June – August (second year). Clusters of small white flowers with 5 petals in a loose, umbrella-like cluster, 2-7” across.


Rosette formRosette Form

* Warning: All parts of this plant are poisonous to both animals and humans. Use caution when managing this plant.