Mulching Mower Blade Maintenance and Thatch Causes

Sharpen mulching blades annually (at least every other year). Thatch comes from dead roots, crowns, and runners—not grass blades, which are mostly water. Mow high and frequently; clippings decompose quickly and don't contribute to thatch.

Grass sticking under the deck usually means mowing too low, too infrequently, or when grass is wet—not a dull blade. Raise the deck, mow often, and avoid cutting wet grass.