RoundUp For Lawns1 Ready-To-Use Refill 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. This fast acting formula starts killing on contact and kills weeds down to the root so they don't come back. In addition, it's rainproof in as little as 3 hours. Roundup For Lawns1is a simple step towards a beautiful, weed free lawn. | RoundUp For Lawns1 Ready-To-Use Refill | Size 1.25 gal