10/15/2026
October’s W**d of the Month is Poison hemlock.
This Colorado List C noxious w**d may resemble parsley or other harmless plants, but it is highly toxic to both humans and animals. Poison hemlock can often be identified by its fern-like leaves, clusters of small white flowers, and hollow stems with distinctive purple or reddish-purple spots.
Early identification and management before the plant produces seeds are important for limiting its spread. If you encounter a plant you suspect is Poison hemlock, avoid touching or disturbing it.
Follow along with our **dOfTheMonth series as we highlight species impacting our open spaces.
