Roundup Dual Action 365 1.25 Gal. Exclusive Formula Refill Weed & Grass Killer powerful one-step weed protection that lasts for up to 12 months. This effective vegetation killer targets and eliminates a wide range of tough weeds and grasses, including clover, dandelion, large and smooth crabgrass, poison ivy, and other broadleaf and grassy weeds as well as brush. Its fast-acting formula becomes rainproof in as little as 30 minutes and delivers visible results within hours, making it an i solution for long-lasting weed control and prevention.