GroundClear Weed & Grass Killer, Ready-to-Use, 1-GallonOrtho groundclear, gallon, ready to use, weed & grass killer, kills all types of weeds & grasses. Absorb on contact & starts working immediately, for use on patios, walkways, driveways, landscape beds, vegetable gardens & under trees, apply any time of year when weeds are small & actively growing, apply directly to the weeds. Rain proof in 2 hours, see results in 15 minutes, omri listed for organic gardening, trigger. Active Ingredient: Ammonium