Not all lawns all the same, but it is easy to think so. In fact, the biggest lawn-care mistake is mowing it too short. Here's how to find out what length to mow your grass and keep it in its best shape.
What Happens When You Cut Grass Too Short
You're more prone to mowing the grass too short if you wait too long between cuttings. Grass that is cut too short and begins turning brown is what's known as a scalped lawn.
A similar problem occurs if you get bald patches in the grass after mowing. Some patches might be dead, but if they're small, they'll grow back slowly. Shady areas are more prone to damage from too low-cut grass or bald spots since they compete with roots and get less leaf area to capture sunlight with.
What Happens When You Cut Grass Just Right
When you mow the grass at the right length, your lawn will grow faster and more densely and deter the growth of weeds as well as pests, cold, disease and drought. Only mow 1/3 inch each time, and focus on mowing it evenly rather than mowing it short so you can avoid bald patches. Maintain a cutting height of 2.5 inches as a general rule.
Rule of Thumb for Grass Lengths
Depending on the type of grass you have, yours has a recommended mowing height range, which allows you to make adjustments for shady, dry or wet areas as well as the season. Mow cool-season grasses higher in spring and summer, and lower in fall and winter. The opposite is true for warm-season grasses.
Warm-Season Grasses
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Bahia: 2 to 4 inches
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Bermudagrass: 1.5 to 2.5 inches
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Buffalograss, carpetgrass & zoysia: 1 to 2 inches
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Centipede: 1 to 3 inches
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St. Augustine: 1.5 to 3 inches
Cool-Season Grasses
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Annual ryegrass: 2 to 3 inches
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Bentgrass: 1/4 to 1 inch
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Fine fescue: 2.5 to 3.5 inches
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Kentucky bluegrass: 1.5 to 2.5 inches
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Perennial ryegrass & tall fescue: 2 to 3 inches
There are also grasses that grow in shade. Ryegrass and Fine and Tall Fescues are examples of shade-tolerant cool-season grasses and need a minimum of four hours of sun. Zoysiagrass and St. Augustine are warm-season grasses that tolerate some shade.
Many lawn grass seeds are a mixture of different kinds of the same species to provide you with the best traits and an even appearance. Others are a mixture of different species for the same season in order to adapt to different environments without the homeowner having to use pesticides or reseed the lawn.
Tips for Better Mowing
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Mow when the grass is dry but not in drought.
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Change the mowing pattern to avoid your grass developing a grain.
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Mow shady areas higher (0.5 to 1 inch).
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Keep your mower blades sharp.
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Water your lawn deeply (1 inch a week) but only when it's dry.
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Mulch grass clippings as fertilizer.
When in doubt, it's always better to mow higher than lower. Remember that every lawn is unique. With these grass height guidelines and mowing tips, you can easily achieve and maintain a healthy, beautiful lawn throughout the year.