Centipede Grass Care: Why High pH, Phosphorus and Early Spring Nitrogen Thin It Out

Centipede grass care is mostly restraint. Centipede (Eremochloa ophiuroides) is a slow-growing, apple-green lawn grass for acid, low-fertility soil in the Southeast, and University of Georgia Extension puts its yearly nitrogen need at 1 to 2 pounds per 1,000 square feet, with the lower end usually enough. Much of what goes wrong comes from adding something: lime, phosphorus, extra nitrogen, a first feeding that comes too early, or a weed killer made for another grass. This guide sets six extension sources side by side (NC State Extension, UGA, UF/IFAS Extension, Alabama Extension, University of Arkansas Extension and Texas A&M AgriLife), shows where they disagree, and turns the overlap into a pH, a mowing height, a nitrogen rate and a month-by-month calendar. To compare centipede with the other nine common lawn grasses, start with the lawn grass types guide.

What kills centipede grass? Five mistakes to avoid

High pH, extra phosphorus, extra nitrogen, a first feeding that comes too early and the wrong herbicide are the five routes to a thinning centipede lawn that the extension sources document. They call the result “centipede decline”: yellowing, then dead patches as spring growth resumes.

High soil pH: the lime bag

Centipede struggles to get iron as soil pH climbs. UGA’s centipede decline guide says iron availability decreases as pH rises past 6.0, and the grass turns yellow (chlorosis). The sources disagree on exactly where the line sits:

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The sources that name a limit put it at 6.0 (UGA, Arkansas) or 6.5 (Alabama, UF/IFAS), so a test result of 5.0 to 6.0 sits inside every range.

Yellow in March is not automatically a pH problem. UF/IFAS says iron yellowing is worst in early spring, when warm days push leaf growth but cool nights limit root growth, and that it fades as the soil warms. If pH really is high, UF/IFAS says lime is seldom required, that a pre-plant dose of 10 pounds of wettable sulfur per 1,000 square feet lowered some Florida soils by one pH unit (no more than 10 pounds per application, 60 days apart), and that centipede may be the wrong grass for high-pH soil. Arkansas Extension limes only below pH 5.0, and UGA only when a soil test calls for it. Iron sprays are a stopgap: UGA says they darken the grass only temporarily, and UF/IFAS says iron is no substitute for nitrogen.

Extra phosphorus: the same iron trap

Phosphorus locks up iron the same way. NC State says centipede does not tolerate high soil phosphorus, and Alabama and Arkansas Extension list high-phosphorus and low-potassium soils among its limits. UGA explains that high phosphorus makes iron unavailable, and recommends a “zero” phosphorus fertilizer such as 15-0-15 unless a soil report says otherwise. UF/IFAS adds that many Florida soils are already high in phosphorus, yet lists adequate potassium and phosphorus among the practices that encourage rooting under nematode stress, so the answer is a lab test, not a rule. Our guide to high-phosphate fertilizer explains the iron-binding effect for other plants.

Extra nitrogen: dark green is a warning

A dark green centipede lawn is not a goal. UF/IFAS says overfertilizing with nitrogen for a darker colour reduces cold tolerance and is believed to contribute to decline, and that established centipede needs about 50% less nitrogen than other Florida lawn grasses. UGA calls the dark green that follows heavy nitrogen a possible primary cause of decline. The mechanism is thatch: UF/IFAS explains that centipede stolons are high in lignin, which resists decay, so high nitrogen builds a thick thatch layer. New stolons then grow on top of it, rarely root into the soil and are prone to injury from drying and cold. A soft, spongy feel underfoot usually means too much thatch, according to UGA.

Feeding too early in spring

“A common mistake is to fertilize centipedegrass too early in the spring,” UGA’s decline guide says: the first nitrogen goes on only when soil at 4 inches is consistently 65°F.

UGA’s turf guide gives the reason. Centipede can start growing, then turn yellow after a late cold snap, and spring conditions favour large patch (Rhizoctonia). Delaying the first nitrogen until 65°F “can mitigate” how often and how badly it strikes, a reduction in risk rather than a cure. Calendar dates disagree: UF/IFAS says not before April 15 in north Florida, NC State’s schedule puts the first pound in May, and Arkansas Extension waits until June. A soil thermometer pushed 4 inches in settles it for your yard.

The wrong herbicide

NC State says centipede is sensitive to many commonly used herbicides, and Alabama Extension calls herbicide injury a common cause of decline. Two traps stand out. Centipede greens up by early March or late February, and during green-up it is very susceptible to 2,4-D and many other products, according to NC State’s Craven County agent. And Arkansas Extension advises against glyphosate for winter weeds because centipede “never goes completely dormant.” The weed-killer table below shows what the sources name.

How do you tell centipede grass from look-alikes?

Look at the leaf tips to separate it from St. Augustine; for carpetgrass, check leaf width. Alabama Extension says centipede has pointed tips in an alternating pattern, while St. Augustine has rounded tips arranged opposite each other. It matters because NC State mows St. Augustine at 2.5 to 4 inches and centipede at 1 to 2.

Where does centipede grass grow?

Centipede grass is a Southeastern lawn grass. Each state extension service words its range a little differently:

Outside those regions, treat centipede as a gamble. Shade is the other limit: UGA says it keeps acceptable colour with as little as 6 hours of filtered or intermittent sun a day, Alabama Extension says it needs 6 or more hours of direct sun, and Texas A&M rates its shade tolerance moderate.

Seed, plugs or sod: which to plant, and when?

Sod is fastest and, per UF/IFAS, gives the best-quality lawn but costs more than seeding or plugging; seed is slow. NC State says seeded centipede may take two to three years to fill in. Time every method by soil temperature, not the calendar: NC State’s Pender County center says warm-season seed germinates and develops properly when soil holds a constant 65–70°F.

Seed needs more care than the rate suggests. UF/IFAS says to mix it with 10–20 pounds of dry sand, and Alabama Extension adds spreading half in one direction and half crosswise. Both say to buy seed at least 90% pure with at least 85% germination. UF/IFAS says to water lightly every day for the first 2–3 weeks, then less often but more deeply, and to mulch lightly so 50–75% of the bare ground is protected. Arkansas Extension adds a trap: seed only if no preemergence herbicide went down in the last two months. For exact pounds, use our grass seed calculator, which lists centipede at 0.25–0.5 lb per 1,000 sq ft.

UGA, Alabama and Texas A&M name two varieties, Common and TifBlair (UF/IFAS also lists the proprietary Covington and Santee). TifBlair is the only certified cultivar; UGA says it has a denser canopy and suits cooler areas, and Arkansas calls it the most cold-tolerant seeded variety. Reseeding a dead patch in an established lawn is “very difficult” and usually needs hand watering, UF/IFAS warns, because sprinklers set for the whole lawn overwater the healthy grass.

How high should you mow centipede grass?

Mow centipede grass at 1.5 inches. It is the only height inside every range the sources give:

Remove no more than a third of the blade (UF/IFAS; Alabama says 30%), and never scalp in early spring: Arkansas Extension says centipede spreads by above-ground stems that scalping injures. UF/IFAS says clippings do not cause thatch. Do not use the cool-season rules in our summer lawn care guide here: its table gives 3–4 inches for cool-season grasses and 1–2.5 inches for warm-season ones.

How much nitrogen does centipede grass need per year?

About 1 pound of nitrogen per 1,000 square feet a year, and 2 pounds is the ceiling Arkansas sets. The figures differ, and even NC State disagrees with itself:

One pound is the only figure inside every range. UGA’s way to apply it is three doses of 1/3 pound or four of 1/4 pound. UF/IFAS adds that a late feeding slows next spring’s regrowth, and Arkansas skips fertilizer from September through February. Bag math: a 15-0-15 fertilizer, UGA’s example of a zero-phosphorus product, is 15% nitrogen, so 1/3 pound of nitrogen is 2.2 pounds of product (0.33 ÷ 0.15) per 1,000 square feet. Our fertilizer calculator does that conversion for any bag.

Centipede grass care calendar by month

This calendar follows the Southeast, from the Carolinas and Georgia through north Florida and west to Arkansas, using the dates in the sources above. Where the calendar and a 65°F soil reading disagree, believe the thermometer.

What are the main centipede grass problems, and how do you fix them?

Most centipede problems start below ground, so check the roots and the pattern before spraying anything. Brown in a dry spell may be dormancy: UF/IFAS says centipede survives drought by going dormant and usually recovers soon after rain, and Arkansas says it survives several weeks without water, though NC State lists drought among its weaknesses.

Which weed killers are safe on centipede grass?

The sources name atrazine and a few labelled products, and they argue about 2,4-D. These are examples from extension documents, not product recommendations: read the label and ask your county office, because labels change and the Arkansas sheet was last revised in 2016.

The 2,4-D split may be about timing: NC State’s warning is about green-up, and Arkansas says to spray only when weeds are actively growing. Waiting until green-up is over would satisfy both, though neither source says so outright. A dense lawn helps too: the Craven agent quotes Clemson that a healthy lawn can outcompete lawn burweed.

When centipede is the wrong grass

Switch if the spot has high-pH soil, foot traffic or deep shade. UF/IFAS says centipede may not be appropriate in high-pH soil, NC State rates its wear tolerance 1 to 2 on the 6-point scale, and Alabama Extension says it cannot take heavy shade. The grass types guide compares nine other grasses. For a small patch where no lawn grass will grow, see our creeping thyme lawn guide or the lawn alternatives guide.

Centipede grass questions

How often should you fertilize centipede grass?

Once to four times a year in small doses, for about 1 pound of nitrogen per 1,000 square feet in total (UGA’s range is 1–2, lower end usually enough). UGA suggests three doses of 1/3 pound or four of 1/4 pound; NC State’s basic schedule is a single pound in May. Arkansas sets a ceiling of 2 pounds.

When should you fertilize centipede grass in spring?

When soil at 4 inches is consistently 65°F and rising, according to UGA. UF/IFAS says not before April 15 in north Florida, and NC State’s schedule puts the first pound in May.

What is the best mowing height for centipede grass?

1.5 inches. It is the only height inside all seven ranges: six extension services (NC State, UGA, Alabama, UF/IFAS, Arkansas, Texas A&M) plus an NC State county agent.

Why is my centipede grass turning yellow?

Often iron chlorosis in early spring: soil pH above 6.0–6.5, too much phosphorus, or cool nights that limit roots, which fades as soil warms (UF/IFAS). A late cold snap (UGA) or herbicide injury (Alabama) can also yellow it. Test the soil before adding iron or nitrogen, because iron does not replace nitrogen.

Does centipede grass need lime?

Rarely. UF/IFAS says lime is seldom required, UGA limes only when a soil test indicates it, and Arkansas limes only below pH 5.0. Centipede prefers pH 5.0–6.0.

Start with a soil test

Before you buy lime, fertilizer or weed killer, find out your soil pH, phosphorus and potassium, because they decide whether lime and fertilizer will help or hurt. Your county extension office can tell you how to send a sample to the state lab; UGA and UF/IFAS both describe the process. Then use the fertilizer calculator to turn 1 pound of nitrogen into pounds of your bag, and wait for 65°F soil to put it down.

Sources

1. University of Georgia Extension. Lawns in Georgia: Selection and Species (B 1533). University of Georgia
2. UGA Cooperative Extension, Appling County. Centipede Grass Decline, reproducing the UGA specialist guidance. University of Georgia, 2017
3. NC State Extension. Carolina Lawns: A Guide to Maintaining Quality Turf in the Landscape (AG-69). North Carolina State University
4. Unruh, J. B., Lindsey, A. J. and Schiavon, M. Centipedegrass for Florida Lawns (ENH8). UF/IFAS Extension, revised March 2024
5. Edwards, L. and Han, D. Home Lawns: Centipedegrass (ANR-0073). Alabama Cooperative Extension System, 2020
6. Boyd, J. Lawn Care Calendar: Centipedegrass (FSA6120). University of Arkansas System Division of Agriculture, revised 2016
7. Chalmers, D. and McAfee, J. Turfgrass Selection for Texas (L-5519). Texas A&M AgriLife Extension
8. Glasgow, T. Lawn Burweed in January. N.C. Cooperative Extension, Craven County Center
9. Fox, G. What Is Wrong With My Centipedegrass? N.C. Cooperative Extension, Beaufort County Center, April 2024
10. N.C. Cooperative Extension, Pender County Center. Planting Summer Grass. NC State Extension, 2022