The dual-action formula of Roundup Concentrate Extended Control Weed & Grass Killer Plus Weed Preventer II kills existing weeds down to the root, guaranteed!* And keeps new weeds from growing for up to 4 months. Plus, the Roundup Extended Control can be used on driveways, sidewalks and patios; along...

Prevents new weeds from growing for up to 4 months by creating an invisible barrier. Kills existing weeds and grasses to the root