Use Ortho GroundClear SUPER Weed & Grass Killer1 to kill 175 types of tough weeds and grasses including crabgrass, dandelion, nutsedge, and oxalis (as listed). Apply around 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. It's fast-acting - weeds absorb it on contact so you'll start to see weeds and grass wilt within hours and completely die off in 1-2 weeks.