Spectracide Weed & Grass Killer with Extended Control Concentrate, 32-Ounce EXTENDED WEED AND GRASS CONTROL: Kills all types of weeds and grasses down to the root, and prevents weeds from coming back for up to 5 months. QUICK-KILL FORMULA: Visible results in as little as 3 hours. RAINFAST: Rainfall or watering 15 minutes after application will not wash away effectiveness. CONCENTRATE: Mix and apply with a tank sprayer  spray to completely cover the leaves of the target vegetation. COVERAGE: 32 ounces makes up to 10 gallons and 40 ounces makes up to 13 gallons.