How long should you wait to seed bare spots after applying herbicide?

Waiting 2 to 3 weeks to seed bare spots after applying herbicide is essential to ensure the herbicide has degraded sufficiently in the soil. Herbicides, particularly those that are pre-emergent or systemic, can remain active for a period of time that may inhibit the germination of new seeds or harm emerging plants.

By allowing a few weeks to pass, you reduce the risk of negative interactions between the herbicide and the new seeds. Many types of herbicides need time to break down, and seed germination could be adversely affected if seeds are planted too soon. This timeframe also allows for any residual effects of herbicide to diminish, thus increasing the likelihood of successful germination and establishment of new grass in those bare areas.