The dual-action formula of Roundup® Ready-To-Use Extended Control Weed & Grass Killer Plus Weed Preventer II with Pump ‘N Go® 2 kills existing weeds and prevents new ones from growing for up to 4 months—and it kills them down to the root, guaranteed!* Plus, the Weed & Grass Killer can be used on driveways, sidewalks, patios, along fences, curbs, retaining walls, and edges of lawns, as well as on decorative rock or gravel areas. The Pump ‘N Go® Sprayer with an extendable wand provides 10 minutes of continuous spray! Rainproof in 10 minutes with visible results in 3 hours, Roundup® works. Fast.