– Emma Matcham, Eugene Law, PhD, Ted Wiseman, OSU Extension
Fall is a good time of year for managing perennial weeds.
Fall is an important time of year for managing perennial weeds in forage crops, especially pastures. Some weed issues were exacerbated in 2025 due to last year’s drought, and we’ve seen many pastures and hayfields with high levels of hemp dogbane, milkweed, Canada thistle, and others. Perennial species can be particularly hard to control since their root systems and other underground structures allow them to regrow quickly after their above ground structures are killed. Fall is an important window for perennial species control, since actions taken now can reduce the amount of energy they store underground for next year.
Frequent mowing is a type of mechanical weed control that helps deplete the amount of carbohydrates that plants have stored in their root systems. Over time, plants that . . .
Continue reading Managing Perennial Weeds in Pastures and Hayfields this Fall