Use Ortho GroundClear Super Weed & Grass Killer1 kills 175 different types of weed and grasses including crabgrass, dandelion, nutsedge, and oxalis. The quick kill, dual-action formula starts working immediately as one ingredient kills on contact while the other penetrates deep into the plant to kill all the way down to the roots. Sprayed weeds usually begin to wilt within hours after being treated, with weeds completely killed in 1 to 2 weeks. Apply this ready-to-use weed and grass killer in landscape areas, patios, walkways, gravel, mulched areas, along houses and fence lines, and on driveways when weeds are actively growing and the air is calm. To use this refill bottle, remove the Comfort Wand from an empty Ortho GroundClear Super Weed & Grass Killer1 container and attach the sprayer holder to this refill bottle by sliding the holder down onto the knob. Next insert the hose connector into the spout until it clicks. Now you can use the continuous spray Comfort Wand to start killing weeds easily and accurately without any bending, pumping, or hand-fatigue. Rainfall or watering 15 minutes after application will not reduce the effectiveness of this powerful weed control.