Spectracide® One-Shot™ weed and grass killer concentrate works fast to kill unwanted weeds and grass. This powerful formula kills from the leaves to the roots and prevents regrowth for up to five months. Plus, 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. Spectracide® One-Shot™ weed and grass killer's formula gives you control over weeds and grass, roots and all. When mixed with water, this 32 oz concentrate formula covers up to 500 sq-ft. For excellent results apply during warm, sunny weather when weeds are actively growing and temperatures are above 60 deg F. This formula is rain safe within 1 hr. Pets and people may re-enter treated area once sprays have dried.