Roundup for Lawns2 is a tough weed killer for use on Northern grasses that kills weeds, not the lawn! This tough weed killer kills 253 types of weeds and works fast on hard-to-kill weeds (see inside booklet for weed list). It won't harm lawns when used as directed on Northern grasses, including Bluegrass, Fescue, Zoysia, Perennial Ryegrass. The fast acting, lawn-friendly 32-oz. concentrate formula covers up to 5,000 sq. ft. This product starts working immediately, is rainproof in as little as 3 hours, and controls weeds for up to 3 months (as listed). Roundup For Lawns2 kills the root so weeds won't come back. Apply Roundup For Lawns2 to actively growing weeds during the early growth stages for the best results. Apply in the spring or fall when daytime temperatures are between 45°F and 90°F. Roundup For Lawns2 is a simple step for home lawn care. No weeds. No worry.