Techneclly you can plant the same do if your doing a no till. If you are working the soil you will need to wait about 14 days. We suggest that you mow the weeds/grasses before a rain, this stimulates growth. After the rain wait about 2 days ans spray the Round-Up. Round-Up is a broad spectrum herbicide and kills everything, unless it is specifically Round-Up ready. Working the soil will bring seed ans spore up to the surfacre where it will becing to grow.