Prowl H20 Herbicide (pendimethalin)Prowl H20 Herbicide (pendimethalin), EPA # 241 418, READ THELABEL Prowl H20 provides pre emergence, residual control of annual grasses, and control or suppression of some annual broadleaf weeds in bearing and non bearing vineyards. Apply 3. 2 to 6. 3 quarts per acre surface sprayed, either in a single application or sequentially with an interval of 30 days or more, with a maximum of 6. 3 quarts per acre surface sprayed per season. For newly