Poison hemlock is an invasive plant in the U.S., originally brought as an ornamental in the 1800s. It is highly toxic, with even a small amount being deadly if ingested. The plant is biennial, growing low to the ground in the first year and shooting up a tall stalk with white umbrella-shaped flowers in the second year. It can be found in various habitats and is a threat to livestock. Identifying features include fern-like foliage, purple spots on the stems, and a musty odor. It is best to destroy the plant early with herbicides or by removing the entire tap root. Skin irritation may occur upon contact.
