SedgeHammer Turf Herbicide for Nutsedge and Weeds WP 1000 Sq Controls yellow and purple nutsedge and certain tough broadleaf weeds like horsetail.Also suppresses green kyllinga. Low use rate (1 1/3 oz/Acre or less) or .9 grams per 1000 square feet. Controls nutsedge by moving through the plant and affecting the underground growing points (rhizomes and tubers). It controls nutsedge after emergence in cool and warm season turfgrass (including St. Augustinegrass, Bermudagrass, Kentucky bluegrass, tall and fine fescue, and perennial ryegrass) This product is effective if no rainfall occurs within 3 hours, but best results are obtained with no rainfall or irrigation for at least 4 hours 1.33oz Container: Using included spoon, which measures .9 grams, Avoid contact of this product to leaves of desirable plants since foliar injury, discoloration or death may result