Ortho Ground Concentrate Clear Vegetation Killer (Case of 12), 32 oz Kills existing vegetation and prevents new growth for up to 1 year Use on driveways, patios, gravel paths, fence rows and rock landscapes where no vegetation is desired 5% Glyphosate, 0.08 % Imazapyr 32-oz. container mixes with water to cover up to 75 sq. ft