Timing Pre-Emergent for Poa Annua After Fall Fescue Overseeding in North Carolina

Yes, It Works

Once fescue has germinated and been mowed twice, it is no longer susceptible to pre-emergent herbicides. The herbicide label will state the safe interval for new seedings—usually directly on the label. If not, your guideline (post-germination + two mowings) is sound.

Key Point

Pre-emergents prevent seed germination only. Established plants are unaffected.