Depends on the type of grass. For cool season grass like fescue, rye and Kentucky blue, use 2.75 oz per gallon of water per 1,000 sq. ft. Second app. 30 - 60 days later. For warm season grass like Bahia, Buffalo, Carpet, Centipede Zoysia and Bermude the rate is 5.5 oz/gal. St. Augustine rate is 4 oz/gal.