Kills weeds to the root. Starts working immediately. For use around perennial landscape plants, shrubs or trees, on patios, walkways, driveways, gravel or mulch beds, along fences, around buildings, preparing landscape areas & lawn renovation. For best results, apply when weeds are actively growing and when thew air temperature is above 60 degrees Fahrenheit. Rainfast in 15 minutes. Quick kill formula provides visible results within hours after application.