The product description states: Use on established bermuda grass, St. Augustine grass, centipede grass, bahia grass, zoysia grass, tall fescue, fine fescue, Kentucky blue grass, perennial rye grass, and blends of these grassesI order this, applied it and it burned my grass. I did not read the fine print on the back of the package stating "Do not use on St. Augustine grass."I am contacting Amazon for a refund now.UPDATE: Amazon promptly refunded the money.