Spectracide Weed Stop For Lawns For St. Augustine & Centipede Lawns Concentrate Ready-to-Spray, 32-fl ozKILLS WEEDS, NOT THE LAWN: Won?t harm lawns when used as directed ? controls both emerged weeds and weeds from seeds.WITH ATRAZINE: For lawn weed control in all St. Augustinegrass varieties and centipedegrass.CONTROLS TOUGH WEEDS: Kills established weeds, including dollarweed, sandspur and Florida betony. HOSE-END CONCENTRATE: QuickFlip hose-end sprayer activates spray at the flip of a switch. COVERAGE: Treats up to 3,720 sq. feet.