It's the season once again for one of the deadliest plant in North America, also known as poison hemlock. Here's what to know. advertisement. Poison hemlock has spread throughout the US.

Poison hemlock, a deadly plant that can cause respiratory failure and death, is spreading throughout the U.S. Contact herbicides are the safest way to control poison hemlock, as all parts of the ...

NASHVILLE, Tenn. (WKRN) — A highly toxic plant, that can be deadly if ingested, is spreading fast around the U.S. Poison hemlock (or Conium maculatum) is about to flower in Tennessee, according ...