Lawn Care in Central Florida: Chinch Bugs, Fungus, Water Rules

Anyone who has tried to keep a lawn green in Orlando, Kissimmee, Sanford, or anywhere else in Central Florida has probably fought the same battles: a lawn that looked fine in March and was half dead by August, brown patches that showed up overnight, grass that wasn’t allowed to be watered on the day it needed it most. Central Florida’s sandy soil, year-round heat, hard wet and dry seasons, and patchwork of watering and fertilizer rules make lawn care here genuinely harder than the national advice on a bag of fertilizer assumes.

Short version: Most Central Florida lawn problems trace back to a handful of causes: St. Augustine grass that isn’t the right cultivar for the yard’s sun exposure, watering on the wrong schedule or at the wrong time of day, fertilizing during the June 1 to September 30 summer blackout when it’s banned in many counties, and two pests and diseases, southern chinch bugs and large patch fungus, that show up almost every year in this climate. Matching the grass to the yard, following the local water and fertilizer rules, and catching chinch bugs and fungus early solves most of it.

Why Central Florida lawns are harder than the bag of fertilizer makes it sound

National lawn care guidance is mostly written for cool-season grasses in climates with a single growing season. Central Florida runs on warm-season turf, almost always St. Augustine grass, year-round, with a wet season from roughly June through September and a dry season the rest of the year. Local governments restrict nitrogen fertilizer during the rainy months because it washes straight into storm drains and from there into lakes, springs, and the aquifer. The most common lawn disease here shows up when the weather cools off, not in the summer heat. And water rules are set by regional water management districts that can tighten them during a drought, which is exactly what happened across parts of the region in 2026. None of that is intuitive from a bag of fertilizer bought at a national hardware chain.

Choosing the right grass for the yard

St. Augustine grass is the default lawn grass across most of Central Florida, and it comes in several cultivars that behave differently enough to matter.

Floratam is still the most widely sold St. Augustine sod in Florida, but it has real weaknesses. According to UF/IFAS, it doesn’t persist well with less than about six hours of direct sun a day, has poor cold and shade tolerance, and has largely lost the chinch bug resistance it was originally bred for, which is a big part of why chinch bugs are such a persistent problem here. CitraBlue, a newer University of Florida release, holds up better: a denser canopy that crowds out weeds, better shade tolerance than Floratam, more drought tolerance, and better resistance to gray leaf spot, large patch, and take-all root rot. Palmetto handles full sun or partial shade, though not dense shade, and Bitterblue is known for good cold and shade tolerance. ProVista grows more slowly (meaning less mowing), tolerates more shade than Floratam, and was the first glyphosate-tolerant turfgrass.

For a yard that doesn’t need a manicured, uniform lawn, Bahia grass is worth a serious look. Its extensive root system gives it better drought tolerance than any other common Florida lawn grass, it needs fewer nutrients, and it has fewer pest and disease problems. The trade-off is looks: it doesn’t fill in as uniformly, and its tall seedheads bother some people. It’s a reasonable choice for a side yard, a rental, or anywhere low maintenance matters more than a dense, dark green look. Zoysia is a middle option: similar water needs to St. Augustine, a finer and more manicured look, good tolerance for traffic, and slower growth, though it tends to build up thatch.

Less lawn, fewer problems

The other option is simply having less grass to fight with. Swapping shady corners, slopes, and strips along driveways for native plants and mulched beds cuts watering, mowing, and fertilizer all at once, and those spots are often exactly where St. Augustine struggles most. The Florida-Friendly Landscaping and native plants guide covers how to do it, with a Central Florida plant list. If you live in an HOA, Florida law says association rules can’t prohibit Florida-friendly landscaping, though normal architectural review still applies; the HOA rules guide covers what associations can and can’t require.

Water restrictions: what’s allowed and when

Lawn watering in Central Florida is governed by regional water management districts, and the schedule depends on where the property sits. The St. Johns River Water Management District (SJRWMD) covers Seminole, Volusia, Brevard, and the northern part of Lake County, and Orange County follows the St. Johns rules countywide. Polk and the southwestern part of Lake fall under the Southwest Florida Water Management District, and most of Osceola falls under the South Florida district. The Florida lawn watering restrictions guide covers the rules district by district.

Under the SJRWMD standard year-round rule, lawn irrigation is limited to two days a week during daylight saving time and one day a week during Eastern Standard Time, and never between 10 a.m. and 4 p.m. During daylight saving time, odd-numbered addresses water Wednesday and Saturday, even-numbered addresses Thursday and Sunday, and nonresidential properties Tuesday and Friday. In Eastern Standard Time, odd addresses water on Saturday and even addresses on Sunday. Daylight saving time ends November 1, 2026, so most Central Florida lawns drop to one watering day a week from that date until March. In Osceola, Toho Water Authority customers in Kissimmee, St. Cloud, and Poinciana follow a similar two-day schedule, with nonresidential properties on Monday and Friday.

Drought can tighten all of this, and 2026 has been a drought year. In May 2026, the St. Johns district declared a Phase III extreme water shortage for parts of northeast and central Florida, including its portion of Lake County. Under Phase III, irrigation drops to one day a week (Saturday for odd addresses, Sunday for even), never between 8 a.m. and 6 p.m., with no more than three-quarters of an inch of water and one hour per zone. Polk County and part of Lake are under the Southwest Florida district’s Modified Phase III order, which was extended through March 31, 2027: one day a week based on the last digit of the address, during narrow overnight windows only. As of late September 2026, Orange, Seminole, Volusia, Brevard, and Osceola were not under the shortage orders, but these orders change with rainfall, so check the district’s own site for the live schedule rather than assuming the standard rule is in effect. HOA rules can’t override any of this, either: Florida law bars associations from requiring watering that conflicts with a water shortage order.

A few things are allowed regardless of the regular schedule. Microirrigation and drip systems can run anytime, and so can hand-watering with a hose fitted with a shutoff nozzle. New sod and plants get a temporary allowance under the standard SJRWMD rules: any day for the first 30 days, then every other day for the next 30. Under Phase III that’s tightened to daily for 15 days, three days a week for the next 30, and two days a week for the final 15.

Mowing without stressing the grass

The most common mowing mistake in Central Florida lawns is cutting too short, which stresses the grass and makes it more vulnerable to both chinch bugs and fungal disease. The rule that matters: never remove more than about a third of the grass blade’s height in a single mowing. For standard St. Augustine cultivars, that means keeping the lawn around 3.5 to 4 inches tall; dwarf cultivars can be kept at 2 to 2.5 inches. Bahia does best at 3 to 4 inches, and its tough blades dull mower blades fast, so keep them sharp to avoid a ragged cut that invites disease. Zoysia is kept shorter than St. Augustine, with the right height depending on the cultivar. Mowing more often at the correct height, rather than letting the lawn get tall and then scalping it back down, keeps the grass healthier and more resistant to pests and disease.

Fertilizing legally: the summer blackout

Many Central Florida counties and cities, including Orange and Seminole, have a summer fertilizer blackout running June 1 through September 30 that prohibits applying fertilizer containing nitrogen or phosphorus. The timing lines up with the rainy season, when heavy, frequent rain washes unused nutrients off lawns and into storm drains, canals, and ultimately the lakes and springs.

Orange County’s ordinance, tightened in June 2022, is a good example of how detailed these rules get. Outside the blackout:

No more than 1 pound of nitrogen per 1,000 square feet per application, and no more than 3 pounds per year.
At least 65% of that nitrogen has to be slow-release.
No fertilizer within 25 feet of a waterway.
No phosphorus at any time of year unless a soil test shows a deficiency.
Deflector shields are required on broadcast spreaders near streets and drains.
No fertilizer or grass clippings left on streets, driveways, or in storm drains.

Seminole County has the same 65% slow-release rule and phosphorus restriction, but a 15-foot water buffer.

During the blackout, what’s allowed is a product with zero nitrogen and zero phosphorus: a “summer blend” with micronutrients like iron and manganese, potassium alone, or organic amendments like compost. Outside the blackout window, it’s still worth fertilizing conservatively. Too much nitrogen doesn’t just risk runoff violations, it builds thatch and feeds both large patch and gray leaf spot. Rules vary by county and even by city within a county, so check the local ordinance before buying fertilizer; the county guides for Orange, Seminole, Lake, and Polk cover local rules and contacts.

Chinch bugs: Central Florida’s most common lawn pest

Southern chinch bugs are the most damaging insect pest of St. Augustine lawns in Florida, and Floratam, still the most common cultivar planted, has lost most of the resistance it was originally bred for. Damage shows up as irregular patches of yellowing, then browning, grass, usually starting in the hottest, sunniest, most drought-stressed parts of the lawn, often along driveways and sidewalks where reflected heat is worst. It’s frequently mistaken for drought stress, which delays treatment and lets the infestation spread.

The standard way to confirm chinch bugs rather than guess: take a coffee can with both ends removed, push one end into the soil at the edge of a damaged patch, and fill it with water. If chinch bugs are present, they’ll float to the surface within about five minutes. If the test confirms an infestation, treat the affected area and its margin. UF/IFAS warns that chinch bugs build resistance when the same insecticide class is used over and over, so rotate products with different modes of action (the IRAC number on the label), and favor systemic products, which work longer and are easier on the beneficial insects that eat chinch bugs. A lawn that keeps getting reinfested is worth replacing, in whole or in part, with a better-adapted cultivar or a different grass.

Fungal disease: large patch and gray leaf spot

Large patch, caused by a soil-borne fungus, is the most common fungal disease in Central Florida St. Augustine lawns, and it behaves almost opposite to what people expect: it shows up when temperatures drop below about 80°F, usually November through May, with fall the worst stretch. It appears as roughly circular patches of discolored grass that expand over time, with a darker ring at the active edge and a sunken, brown center. A simple field test: pull a few blades from the edge of a suspect patch. If they detach easily, the base is dark, and it smells like rot, a fungal disease is the likely cause.

Prevention matters more than treatment here. Water only when needed and only in the early morning, since grass that stays wet overnight is exactly what the fungus needs. Use slow-release nitrogen sparingly, and mow affected patches last, cleaning the mower deck afterward so the fungus doesn’t spread to healthy turf. Preventive fungicide works best applied about two weeks before symptoms usually appear, which is roughly late September in North Florida and late October in South Florida, with Central Florida falling in between. Once symptoms are visible, fungicide can stop the spread but may need reapplying through the cooler months.

Gray leaf spot is the summer counterpart. It thrives in warm, rainy spells from May through September, when leaves stay wet for 12 hours or more and temperatures sit between 80 and 90°F. Heavy nitrogen speeds it up by producing lush, tender growth, one more reason to stay conservative with fertilizer even outside the blackout period.

Crabgrass and weeds

The most effective time to stop crabgrass in Central Florida is before it germinates, using a pre-emergent herbicide. UF/IFAS recommends applying it around February 15 in Central Florida, or before daytime temperatures reach 65 to 70°F for four or five days in a row. Applying too late, after crabgrass has already sprouted, means the product won’t work and a post-emergent herbicide is needed instead, which is generally harder on the lawn and less effective. Pre-emergent needs to be watered in within about two days of application to activate it in the soil. SJRWMD’s rules allow watering in a lawn chemical within 24 hours of application outside your normal watering day, so it doesn’t have to wait for your assigned day.

Grassy weeds that do get established are harder, since most products that kill grassy weeds also damage St. Augustine; atrazine products offer limited control of young grassy weeds in St. Augustine lawns specifically. Broadleaf weeds have more options, and St. Augustine tolerates the common combinations of 2,4-D, MCPP, and dicamba, usually with repeat applications per the label. Either way, the most effective long-term weed control isn’t a product at all: a thick, healthy, correctly mowed lawn leaves less open soil for weed seeds to take hold, which is why the right grass, mowing height, and fertilizer timing matter for weeds too.

Frequently Asked Questions

St. Augustine is the regional default, but the cultivar matters. Floratam needs at least six hours of direct sun and has lost most of its chinch bug resistance, while CitraBlue handles shade and drought better and resists large patch, gray leaf spot, and take-all root rot. For low-maintenance areas, Bahia grass is the most drought-tolerant common lawn grass in Florida.

Under the St. Johns River Water Management District’s standard rule, which also covers Orange County, lawns can be watered two days a week during daylight saving time and one day a week during Eastern Standard Time, never between 10 a.m. and 4 p.m. Your days depend on whether your address is odd or even. In 2026, drought orders cut parts of Lake County and all of Polk County to one day a week with tighter hours, so check your water management district’s site for the current schedule.

In Orange, Seminole, and many other Central Florida counties and cities, fertilizer containing nitrogen or phosphorus can’t be applied from June 1 through September 30. Outside that window, Orange and Seminole require at least 65% slow-release nitrogen and ban phosphorus unless a soil test shows a deficiency. Rules vary by county and city, so check your local ordinance.

Do the coffee can test. Remove both ends of a can, push one end into the soil at the edge of a yellowing or brown patch, and fill it with water. If chinch bugs are there, they’ll float to the surface within about five minutes. Damage usually starts in the hottest, sunniest spots, often along driveways and sidewalks.

That’s usually large patch, a fungal disease that shows up when temperatures drop below about 80°F, typically November through May. Look for expanding circular patches with a darker edge and blades that pull out easily from the stem. Water only in the early morning, go easy on nitrogen, and consider a preventive fungicide applied about two weeks before symptoms usually appear.

UF/IFAS recommends around February 15, or before daytime temperatures reach 65 to 70°F for four or five days in a row. Water it in within about two days of application to activate it. Once crabgrass has already sprouted, pre-emergent won’t work.

No. Florida law bars HOA rules from conflicting with water management district rules or a water shortage order, and associations also can’t prohibit Florida-friendly landscaping, though normal architectural review still applies.

Sources

This article is for general informational purposes only and isn’t financial, legal, insurance, or tax advice – for guidance specific to your situation, talk to a licensed professional.

Lawn Care in Central Florida: Chinch Bugs, Fungus, Water Rules, and Keeping Grass Alive