Poison-hemlock is acutely toxic to people and animals, with symptoms appearing 20 minutes to three hours after ingestion. All parts of the plant are poisonous and even the dead canes remain toxic for up to three years. The amount of toxin varies and tends to be higher in sunny areas.

Is hemlock poisonous to humans?

Poison-hemlock grows throughout the United States. It is very toxic and sheep, cattle, swine, horses, and other domestic animals are poisoned by eating small amounts of green or dried plant. It is also extremely poisonous to humans.

Are evergreen hemlock trees poisonous?

Hemlock produces individual male and female cones on the same tree (monoecious plant). ... Unlike poison hemlock, hemlock tree is not poisonous. Needles of hemlock tree contain vitamin C. They can be consumed in the form of tea.