grass comparison of cutting yard with lawnmower sharp blade versus dull blade illustration
Illustration: Rose Lowry
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Why a Clean Cut is Key

A sharp mower blade cleanly slices grass tips (far left), so they heal quickly and aren't open to disease. A dull blade tears them (near left), leaving weakened, jagged edges that turn brown and are vulnerable to disease. You should sharpen your blade after every four to six uses. If you hit something while mowing, file nicked edges right away.

For more, see How to Sharpen Mower Blades.
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