Poison Hemlock

Poison Hemlock is No Joke

Poison hemlock is currently in the growth stages in southern Ohio that are susceptible to early-season management options. Seeds have germinated and last season's rosettes are beginning to "bolt."  Eliminating these plants now can significantly reduce infestations.
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Authors
Joe Boggs

Poison Hemlock: TOO LATE!

Poison hemlock (Conium maculatum) is in full flower in much of Ohio with some plants showing signs of senescence in the southern part of the state meaning flowers are mature and seeds will soon follow. This means it’s too late to reduce the seed bank by targeting flowering plants with herbicides or mowing.
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Authors
Joe Boggs
Get a Head Start on Controlling Poison Hemlock and Wild Parsnip boggs.47@osu.edu Thu, 03/31/2022 - 14:05
Poison hemlock and wild parsnip are currently in a growth stage that makes them susceptible to early-season management options. Targeting these dangerous plants now will prevent flowering and seed production.
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Authors
Joe Boggs
Poison Hemlock and Wild Parsnip are Bolting and Blooming boggs.47@osu.edu Sun, 05/16/2021 - 14:01
Poison hemlock (Conium maculatum) is one of the deadliest plants in North America. Wild parsnip (Pastinaca sativa) sap can produce severe, painful skin blistering. Both are commonly found growing together in Ohio and both are beginning to bloom meaning the clock is quickly winding down for controlling these non-native nasties.
Published on
Authors
Joe Boggs