June 12, 2025 Editor, The News-Gazette: I enjoy Extension Agent Tom Stanley’s column; he wrote June 11 of poison hemlock. Here are additional comments about this non-native and invasive plant. According to Ohio State University extension, “Many other plants that can have toxic effects on livestock will see those toxins dissipate during the hay drying process, or during fermentation process if hay is ensiled or wrapped. This is not the case with poison hemlock – toxins will remain viable and lethal regardless of the curing and storage methods.”
Furthermore, Ohio Extension indicates, “The goal should be getting rid of existing plants through cutting, mowing or hand removal, and limiting production and spread of seed.” While I am not a proponent of herbicides, Ohio extension says, “ The most effective timing for the application of herbicides is fall when plants are low-growing rosettes in their first year of growth, or early the following spring when plants are still small.” Read more here: https://tinyurl.com/poisonhemlockOSU Personally, I have successfully controlled poison hemlock by cutting it down after flowering with loppers (while wearing protective clothing to prevent severe rash.) Cut it right now, folks! At the very least, you will prevent it from producing seed. MARILYN SHANER BUERKENS Natural Bridge
