Roundup Dual Action 365 32 Oz. Exclusive Formula Concentrate Weed & Grass Killer powerful, one-step weed protection that lasts up to 12 months. This effective formula kills and prevents a wide range of tough weeds and grasses, including clover, dandelion, large and smooth crabgrass, poison ivy, as well as other broadleaf weeds, grassy weeds, and brush. It becomes rainproof in as little as 30 minutes and delivers visible results within hours, making it a reliable choice for maintaining a weed- landscape. Model Number: