If your lawn looked rough last summer—patchy grass, brown spots, or loads of weeds—there’s one simple thing lawn experts say can make a surprisingly big difference: Sharpen your mower blade.
It sounds almost too easy, but a dull mower blade can quietly wreck an otherwise healthy lawn. And right now is the perfect time to fix it before the season of regular mowing begins.
What Happens When Your Mower Blade Is Dull
The condition of your mower blade affects how your grass heals after every cut.
A sharp blade slices grass cleanly, almost like scissors. A dull blade tears and shreds the grass. Those ragged edges can turn brown, lose moisture faster, and leave your lawn stressed, especially in the summer heat.
Torn grass blades are more vulnerable to disease, fungus, and pests. Frayed grass tips create openings where problems can spread quickly during hot, humid weather.
Signs your mower blade may be dull:
- Grass tips look brown a day or two after mowing.
- Uneven cutting.
- Clumps of torn grass left behind.
- Mower is vibrating as you use it.
And if you hit sticks, rocks, roots, or curbs last year, there’s a good chance your blade edge is no longer clean.
How Often Should You Sharpen a Mower Blade?
Most homeowners only sharpen mower blades once every few years, but for an average yard, sharpening every 20 to 25 hours of mowing is ideal. For many people, that means at least once or twice during the growing season.
Now is one of the best times to do it since your grass is likely still waking up from its winter slumber.
Sharpening a Mower Blade Is Cheap and Easy
Many hardware stores and garden centers sharpen mower blades. If you take the blade in, the average cost is between $5 and $10. You can also do it at home using a file, grinder, or drill attachment; this will take a little practice, though.
After Sharpening, Raise Your Mowing Height
After sharpening the blade, raise your mowing height slightly heading into summer.
Cutting grass too short is one of the fastest ways to weaken a lawn during hot weather. A good guide is to follow the 1/3-rule.
Taller grass shades the soil, helps retain moisture, and naturally crowds out weeds.
