Poison HemlockConium maculatum
BACKGROUND: Poison hemlock is a European native growing six to ten feet tall. It is commonly found along waterways, roadsides, field edges, and tolerates poorly drained soils. It has been mistaken for parsley and wild carrot. All parts of the plant are toxic.
DESCRIPTION: This biennial has a large taproot. The stems have purple spots, especially at the bases. Leaves are finely divided, having a fern-like appearance. Leaf stems clasp the main stem. The tiny flowers are in umbrella-shaped clusters on the ends of individual stalks. Bloom is in late spring into early summer.
CONTROL: Biocontrol is available and offers fair to good control. Herbicides can offer excellent control when applied to activley growing plants between rosette and bloom stages. Contact your local state or county weed specialist for specific updated information.