The Grass Doctor

Best way to eliminate patch grass?

My lawn is cool season fescue and blue grass mix in Northern California. Each year the patch grass enlarges. I'm told to kill it with a herbicide, then re-seed. Would residual herbicide prevent germination, and if so, how long should I wait? Please share your experiences. Thanks My herbicide will either be Roundup or generic glyphosate

Public Comments

1. Use a large black/dark colored sail and put it over the patch it will die within a few days , if you want to be certain it will never come back leave it for a while longer , herbicide will most likely make the ground infertile for a few months
2. Typically you're not supposed to re-seed until 3 months after you've sprayed with herbicide. It does depend on the herbicide you purchase. My preference is to lay down weed prevention cloth, tarp, or boards to quickly kill the existing grass and be ready to re-seed immediately.