You can kill weeds without harming your lawn* with Ortho WeedClear Weed Killer for Lawns Concentrate. This weed killer kills over 250 common weeds, including dandelions, clover, poison ivy, sumac, chickweed, and dollarweed (see product label for complete weed list). It is made especially for residential lawns and contains three proven ingredients to specifically target and destroy other common lawn weeds, without harming your grass. This herbicide works by entering weeds through their leaves, and moves throughout the plant to kill all the way down to the root. You'll see visible results in hours, and it becomes rainproof within one hour upon drying. This product is a concentrate. It cannot be applied directly out of its container. Mix 2 fl. oz. per gallon of water for every 500 sq. ft. for Northern lawns, or 1 fl. oz. per gallon of water for Southern lawns. Easily apply with an Ortho Dial N Spray or tank sprayer. People and pets may enter the treated area after the spray has dried. For best results, use when weeds are small and actively growing in the spring or fall. One 1 gal. bottle treats up to 64,000 sq. ft.