Spectracide One-Shot Weed & Grass Killer works fast to kill unwanted weeds and grass. This powerful formula kills from the leaves to the roots and prevents regrowth for up to 60 days. It works quickly with visible results same day. Clear out unwanted vegetation on walkways, driveways and patios. Avoid spraying this product onto desirable plants, lawn grasses, shrubs or trees. Gives you maximum control over weeds and grass, roots and all. Rain safe in 1 hour.