Poison Hemlock

Conium maculatum

Bright green fern-like leaves; flowers in numerous small, umbrella-shaped clusters of tiny white flowers.

Life Forms	Forb
Habitats	Abandoned fields Ditches Farm fields Little Habitats Parklands Railroad tracks Residential yards Roadsides Trailsides
ODA Listing	B
Soil and Moisture Conditions	Moist
Suggested Actions	Use BMPs to control on private property
Shade Preference	Full sun Part shade
Mature Height	6-10'
Distribution	widespread in Oregon
Control	Mowing is not recommended due to toxins. For small populations, wear gloves and long sleeves to pull or dig up plants, including entire root. Wash skin after working with poison hemlock. Follow label directions when using chemicals.
Reproduction and Spread	Reproduces by seeds. Produces up to 40,000 seeds per plants, plants are moved by water, animals, and machinery.
Introduced	introduced from Eurasia
Look Alikes	cow parsnip, Queen Anne's Lace
Impact	Acutely toxic to humans, livestock and wildlife; call for help if poisoning is suspected. Aggressive growth, crowds out native vegetation.
More Info	https://your.kingcounty.gov/dnrp/library/water-and-land/weeds/Brochures/Poison-Hemlock_factsheet.pdf