Poison Hemlock (Conium maculatum) is widespread in Ohio and readily colonizes disturbed landscapes such as roadside ditches, fence rows, and other man-made features. There are many sources of information discussing management.
https://www.extension.purdue.edu/extmedia/FNR/FNR-437-W.pdf
https://ipm.missouri.edu/IPCM/2012/2/Weed-of-the-Month-Poison-Hemlock/
https://u.osu.edu/beef/2020/06/10/poison-hemlock-is-blooming/
https://agcrops.osu.edu/newsletter/corn-newsletter/2020-07/poison-hemlock-control
Poison Hemlock look a-like: Wild Carrot (Daucus carota)
https://crops.extension.iastate.edu/encyclopedia/wild-carrot