Almost every lawn around Aiken and North Augusta is a warm-season grass, and almost every one that is thinning, weedy or scalped brown in patches is being mown wrong in one of two ways: too short, or not often enough. Height and frequency are linked, and getting them right fixes more lawns than anything you can buy.
The one-third rule
Never take more than about a third of the blade height in a single cut. A lawn kept at two inches wants cutting by the time it reaches three, not when it reaches five.
The reason is that the roots mirror the top. Remove a lot of leaf at once and the plant sheds root mass to match, which is exactly what you don't want going into a dry July. It also leaves the pale lower stem exposed, which is why a lawn cut after it has got away from you looks scalped and yellow for a week or two.
Heights by grass type
Common bermuda does well in the one-to-two-inch range and will tolerate lower if it is getting full sun. Zoysia sits in a similar range, around one to two inches. Centipede — very common in this area and the one most often abused — wants around one and a half to two inches, and it does not appreciate being cut short.
St. Augustine is the outlier: it wants to be tall, around two and a half to four inches, and cutting it at bermuda height will thin it out fast. If part of the yard is shaded, err toward the higher end of whatever range applies, because a grass in shade needs more leaf area to make the same energy.
Frequency changes through the season
Weekly is the honest answer for most of a CSRA summer. Growth here peaks in the heat, and a fortnightly schedule in June routinely breaks the one-third rule without anyone intending to.
In spring and autumn, every other week is usually fine, and in the depth of winter warm-season grass is dormant and needs nothing. The schedule should follow the grass, not the calendar — which is also why a wet week can mean an extra cut.
Sharp blades, and change the pattern
A dull blade tears the leaf instead of cutting it. The tear browns off at the tip within a day or two, which is what gives a freshly cut lawn that hazy, off-colour look, and the ragged wound is an easier entry point for disease.
Vary the mowing direction between cuts as well. Going the same way every time compacts the same wheel lines and trains the grass to lie over, and both of those show up as stripes that have nothing to do with a nice finish.
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