Applied Pre-emergent in August – Can You Overseed Fescue In October?

Q: If you apply pre-emergent in August can you overseed fescue in October?

A: Sure you can, but you won’t get any weed control from the pre-emergent application you put down in August. Most winter weeds germinate in October, just like your fescue does. In your situation, perfect your seed planting, fertilizing, and watering techniques to help the fescue control weeds rather than putting out a pre-emergent to control weeds in a thinly growing fescue lawn that needs reseeding.