You really can have too much of a good thing. Take fertilizer, for instance. Apply too much to your lawn, or apply it unevenly, and it can result in fertilizer burn. When that happens, the grass will turn yellow—or if it's particularly severe—crispy brown. The good news is that a lawn that's been mildly burned with chemical fertilizer can recover. If you suspect that your lawn has been damaged, flush the mineral salts out of the grass with water. Run the sprinklers until water saturates the yard, then continue to water for the next several days to dilute the fertilizer.