Ortho WeedClear, 1.33 Gallon, Ready To Use Lawn Weed Killer North Refill, Kills Over 250 Listed Weeds Including Dollarweed, Dandelion, Clover & Chickweed, Won't Harm Lawn Grasses When Used As Directed. Apply When Broadleaf Weeds Are Young & Actively Growing For Best Results, Apply When Rain Is Not Predicted For 24 Hours After Application, Results In Hours.