Spectracide Weed & Grass Killer With Extended Control with the AccuShot continuous power sprayer is a ready-to-use weed killer plus preventer that prevents weed growth for up to 5 months (Does not kill all seeds, woody and semi-woody plants, and propagules in the soil, such as tubers and rhizomes). This quick-kill formula acts fast to kill all types of weeds and grasses down to the root, for visible results as fast as 3 hours. This product is rainproof in 15 minutes ? rainfall or watering 15 minutes after application will not wash away effectiveness. Spectracide Weed & Grass Killer With Extended Control works the first time, every time! Use along fences, paths, patios, sidewalks, curbs and driveways and around established ornamental trees, shrubs, flower beds, plantings and buildings. Use for trimming and edging landscapes. For best results, apply in warm, sunny weather when the temperature is over 60 degrees.