Ortho 1-Gallon Ready-to-Use GroundClear Weed & Grass Killer. It effectively kills all types of weeds and grasses, absorbing on contact and starting to work immediately. Suitable for use on patios, walkways, driveways, landscape beds, vegetable gardens, and under trees, this weed killer can be applied any time of year when weeds are small and actively growing. Simply apply directly to the weeds and let it work its magic. Rainproof in 2 hours, you'll see results in just 15 minutes. OMRI listed for organic gardening. Comes with a trigger. Active ingredient: 5% Ammonium Nonanoate.