Preen lawn weed killer is a fast acting liquid that kills weeds not lawns. it works by moving through the leaves of broadleaf weeds into the roots stopping the growth of the plant. preen lawn weed killer is a combination of three proven weed killers.

Active ingredients: 5.56% 2, 4-dichlorophenoxyacetic acid, 1.34% propionic acid, .062% salt of dicamba.