Roundup® Concentrate Extended Control Weed & Grass Killer Plus Weed Preventer Catalog Lawn Weed Control Roundup® Concentrate Extended Control Weed & Grass Killer Plus Weed Preventer UPC : 070183570508 Description Dual-action formula kills existing weeds and keeps new ones from growing for up to 4 months. Ideal for large jobs. Kills the Root! 32 Ounce. Rates Please contact us for current pricing and availability.