Roundup 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 concentrate formula is easy to mix and measure and is the best value when applying product to your entire lawn. It only takes one bottle to cover up to 5000 sq-ft. 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 for lawns2 is a simple step towards a beautiful, weed free lawn.