Roundup For Lawns1 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. It won't harm lawns when used as directed on northern grasses, including bluegrass, fescue, zoysia, perennial ryegrass. This ready-to-use product starts working immediately, is rain-proof in as little as 3 hr and controls weeds for up to 3 months. To set up the included extend wand, just insert the plug at the end of the hose into the knob on the cap until it clicks, then twist the knob on. Roundup For Lawns1 kills the root so weeds won't come back. Apply Roundup For Lawns1 to actively growing weeds during the early growth stages for the excellent results. Apply in spring or fall when daytime temperatures are between 45 deg F and 90 deg F. Roundup For Lawns1 is a simple step for home lawn care. No weeds. No worry.