Spectracide Weed Stop For Lawns Plus Crabgrass Killer Concentrate, Ready-to-Spray, 32-Ounce KILLS WEEDS, NOT THE LAWN: Wont harm lawns when used as directed  kills more than 250 types of weeds as listed. CONTROLS CRABGRASS: Controls major broadleaf and troublesome grass weeds, including crabgrass, dandelion, chickweed and clover, as well as foxtail and yellow nutsedge (see product label for complete list). KILLS THE ROOT: Visible results in 8 hours. RAINFAST: Rainfall or watering 3 hours after application will not wash away effectiveness. MONEY-BACK GUARANTEE: Guaranteed results or your money back  see product label for details.