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Thin or bare lawn: find the cause before you fix it

A thin lawn has a cause, and Clemson lists the usual ones as mowing, watering or fertilizing wrong, poor drainage, compacted soil, too much thatch, the wrong grass for the spot, too much shade, tree root competition, winter injury, incorrect pesticide use, and pests such as insects or weeds. Clemson's first rule is to find the cause, because replanting over an unsolved problem gets you another failed lawn.

Why is my lawn thin?

Start with the cheapest checks. Walk it: if it feels like concrete, Clemson says compaction could be the problem. Look up: if the thin area gets less than four hours of sun, see our shade page. Look at the patches: circular brown areas in spring suggest large patch, and yellowing near the driveway in summer suggests chinch bugs. Then test the soil.

Why does a soil test matter so much?

The test shows pH and nutrient levels, and warm-season grasses have specific targets. Clemson's target pH is 6.0 to 6.5 for zoysia, bermuda and St. Augustine and 5.5 to 6.0 for centipede. Centipede growing in soil with too high a pH shows iron chlorosis (yellowing), and over-fertilized centipede develops centipede decline. Clemson samples lawns 2 to 4 inches deep from 8 to 10 or more spots mixed together.

Can I seed the bare spots?

In many cases you can't. Many warm-season varieties are sterile and can't be grown from seed; Clemson names centipede, common bermuda and Japanese lawngrass among the exceptions. Bermuda, centipede and St. Augustine spread by runners, and zoysia spreads slowly. In practice a warm-season lawn fills bare spots by spreading into them during the growing season, or you patch them with sod or plugs.

When is the right time to repair a warm-season lawn?

Clemson says spring or early summer, April to June, and warns that fall renovation of warm-season grass often ends in winter injury. The maintenance calendars say to replant large bare areas in May with sod, plugs or sprigs.

How does Spring Green help a thin lawn?

New customers get a soil test on the first visit, and we build the fertilizer program around what the test shows. We don't do core aeration. We offer liquid aeration, applied in May and June. We don't install sod.

Last updated 2026-09-25. Spring Green is owned by Stockton Wells.