Ortho GroundClear Year Long Vegetation Killer kills weeds, grasses, and all vegetation to the root and prevents weeds and weeds and grasses from growing for up to 1 yearFast acting formula starts working immediately and is rainproof in 1 hourFor best results, apply on a sunny day when temperatures are above 60°FFor use on driveways, sidewalks, fence lines, paver patios, walkways, gravel areas, rock and desert landscapes, under decks, parking areas, cleared dirt, sandy areas, hardscapes and along fences and curbsThe refill is convenient and easy to use: remove the existing wand and holster from the original bottle of Ortho GroundClear Year Long Vegetation Killer Ready-to-Use and attach it to GroundClear Year Long Vegetation Killer Refill container