According to Purdue Extension, Poison Hemlock can be found along roadsides, farm fields, and railroad tracks. The plant is considered a biennial – which means it lives over the course of two years. The stalk can grow between three and eight feet tall.
Although it may be difficult to find with an untrained eye, Poison Hemlock can be quite harmful to both humans and livestock. Purdue Extension has said that all parts of the plant can be toxic, but the intensity of the poison can vary depending on the season.
Weed scientists recommend disallowing animals to graze on the plant. Young animals are the most susceptible.
Certain herbicides can help control Poison Hemlock growth and spreading.