Weed killer formulated to kill tough weeds in your lawn, when used as directed. The formula kills ground ivy (creeping charlie), speedwell (veronica), wild violet, and other tough lawn weeds as listed. Plus, it is rainproof 6 hours after application. Can be applied to Buffalograss, Fescues, Kentucky Bluegrass, Ryegrass, and Zoysiagrass. Apply when weeds are actively growing and temperatures are below 90 Deg F.