Roundup® Extended Control Weed & Grass Killer Plus Weed Preventer Concentrate 32-OZ. Dual-action formula works two ways: kills existing weeds and grasses down to the roots; and prevents any new weeds and grasses from growing for up to 4 months. Rainproof in 30 minutes. Visible results in 24 hours.

The ultimate in weed control. Dual action formula kills existing weeds and grasses—roots and all—
and prevents new ones from growing. *A four-month preventative formula may be available in some areas.