Ortho Groundclear, 32 OZ, Concentrate, Weed & Grass Killer, Begins Working Immediately, Quick, Visible Results, See Results In 15 Minutes, Ideal For Use On Patios, Pavers & Landscape, Kills All Types Of Weeds & Grasses, For Organic Gardening, Omri listed for organic gardening. Rainproof in 2 hours (upon drying). Active ingredient: Ammonium Nonanoate