Spectracide Weed & Grass Killer Concentrate2, 16-Ounce KILLS WEEDS AND GRASSES: Use on driveways and walkways, and around fences, trees, flower beds, shrubs and other areas in your yard. FAST-ACTING FORMULA: Visible results as fast as 3 hours  replant new flowers, trees and shrubs the same weekend. RAINFAST: Rainfall or watering 15 minutes after application will not wash away effectiveness. CONCENTRATE: Mix and apply with a tank sprayer  spray to completely cover the leaves of the target vegetation. MONEY-BACK GUARANTEE: Guaranteed results or your money back  see product label for details.