Spectracide Weed Stop, 32 oz., broadleaf herbicide, ready to use, trigger sprayer for lawns. Contains a crabgrass killer and kills over 470 weeds including dandelion, clover, poison ivy, chickweed, and yellow nutsedge. Won't harm lawns when used as directed. Visible results In 5 hours. Active ingredients are 2,4D, Quinclorac, Dicamba, Sulfentrazone.