How to identify and treat poison hemlock, one of the deadliest plants

How to identify and treat poison hemlock, one of the deadliest plants

poison hemlock (Conium maculatus L.) has spread like wildfire throughout greater Columbus (and much of Ohio) in recent years, and if it has taken hold on your property, now is the best time of year to control this non-native invasive weed.

Targeting this dangerous plant with herbicides applied now will prevent flowering and seed production later this summer. Landowners often try to control this deadly weed later in the growing season when it reaches several feet tall.

If this weed has been present on your property in previous years, now is a good time to go out and detect the presence of this weed. I have monitored several patches of this weed on my campus farm in Columbus, and this year the weeds appear to have sprouted and started pushing out new growth a couple of weeks earlier than usual. Last week I found hundreds of these plants that were over a foot tall before April 1st!

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