4 Reasons to Water in Fertilizer Right Away to Avoid Brown Patches

Fertilizer burn happens when nitrogen salts sit on grass blades and pull moisture out of them, leaving crispy brown spots. Watering immediately after application prevents this.

Water deeply enough to wash granules off the leaves and into the soil. For spray-on fertilizers, water them in within a few hours.

Quick-release synthetic nitrogen, like ammonium sulfate, greens up fast but burns easily. Slow-release or organic fertilizers release nitrogen gradually and are harder to mess up.

If brown patches keep happening, switch to a slow-release formula. Your lawn does not need a big dose all at once—steady feeding works better.