Key Features Kills weeds, not the lawn Kills crabgrass, dandelion, clover and yellow nutsedge Kills 253 types of weeds Starts working immediately Kills the root Starts working immediately Roundup? (r) for lawns is a formula that kills weeds, not the lawn. It controls over 250 common lawn weeds, roots and all and is especially effective on hard-to-kill weeds such as crabgrass, dandelion, clover and yellow nutsedge. The ready-to-use formula with our extended wand makes it easier than ever to spot-treat lawn weeds, without bending over. This fast acting formula starts killing on contact and kills weeds down to the root so they don't come back. In addition, its rainproof in as little as 3 hr. Roundup? (r) for lawns1 is a simple step towards a beautiful, weed free lawn.