Weed-B-Gon MAX is weed deadly, lawn friendly - guaranteed! Visible results in 24 hours. 100% root kill. Rain-proof in one hour. Kills over 200 types of weeds. Exclusive LawnGuard formula. Use throughout the season to help control weeds in the lawn without killing your lawn. Active ingredients: 13.72% MCPA; 1.56% triclopyr; 1.35% dicamba.