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.