Dealing with poison hemlock
We have an abundance of poison hemlock. After viewing several sources online, I'm certain of the type of weed I have. What is the best way to get rid of it? Is there any way to slow or prevent its growth?
Linn County Oregon
Plowing or repeated cultivation will prevent poison hemlock from establishing. Digging poison hemlock can be effective when caught early and the plant population is small. Take care when digging or mowing poison hemlock. Wear rubber gloves and a mask when handling this plant. On a hot day, the plants’ toxins may be absorbed into the skin.
Do not burn the plant, as the smoke can contain deadly toxins.....
Treating poison hemlock with herbicides is most effective in late spring or early summer. Several combinations of herbicides are effective, including 2,4-D plus dicamba (2.5lb + 1 lb a.i./acre). Glyphosate and triclopyr have also been used with success. Herbicides should be used on seedlings or small rosettes and not on fully mature plants for ultimate success. To achieve complete eradication, repeated applications may be required until the seed bank has been depleted.
Please use caution; herbicides sprayed within 50 feet of a body of water can pose significant environmental hazards and typically require an aquatic herbicide. Be sure to contact your local weed control authority or OSU Extension for specific herbicide recommendations, and check the herbicide label for restrictions."