It s time to take control of weeds. Ortho GroundClear Vegetation Killer 1 gallon concentrate kills unwanted weeds and grasses and prevents regrowth for up to 1 year when properly applied. One application of the fast-acting dual-action formula will eliminate weeds from driveways sidewalks patios gravel paths fence lines and other areas where no vegetation is desired. It is easy to apply in either a watering can or tank sprayer; enjoy visible results within hours of application!