Ortho RTS Weed B Gon Weed Killer for St. Augustinegrass 32 oz (Sold in select Southern states) For use on St. Augustinegrass including Floratam Kills 250+ listed weeds (See label for listed weeds.) Wont harm the lawn  Guaranteed (When used as directed.) Rain-proof in 1 hour Treats up to 2,500 sq. ft.