General Description: Poison Hemlock can quickly infest large areas of pasture as well as open waste places.
Caution: The entire plant is toxic to animals and humans, containing the poisonous alkaloid coniine and other alkaloids. Therefore, always wear gloves and protective clothing if handling poison hemlock.
Mechanical Control: Digging up small infestations and removing the entire taproot is effective. Mowing is ineffective as plants will re-sprout, sending up new stalks in the same season mowing occurs.
Herbicide Control: Please refer to the Pacific Northwest (PNW) Weed Management Handbook, or contact your county noxious weed coordinator or Washington State University (WSU) Extension office for additional chemical options.
