Ortho GroundClear Vegetation Killer Ready-To-Use, 32-Ounce Kills existing vegetation and keeps the ground clear for up to 1 year Use on driveways, patios, gravel paths, fence rows and rock landscapes where no vegetation is desired Ready-to-use product available with sprinkler cap  no mixing or measuring! Rainproof in 1 hour Ideal for large or small areas Kills existing vegetation and keeps the ground clear for up to 1 year Use on driveways, patios, gravel paths, fence rows and rock landscapes where no vegetation is desired Ready-to-use product available with sprinkler cap  no mixing or measuring! Rainproof in 1 hour Ideal for large or small areas