A fairy ring comes from a fungus feeding on buried organic matter. UF/IFAS Extension Charlotte County says fairy rings do no long-term damage to a lawn, so a ring is not a rush job. The mushrooms are another matter. Treat them as poisonous and remove them so children and pets do not eat them.
The ring lasts as long as its food and warm, rainy weather last. What you can plan is the fix for a dead strip and the price of patching it. Ask for a written, itemized price after the crew walks your Tampa yard and measures it.
Fairy ring in lawn: what feeds it, what looks like it and whether it can wait
What is under a circle of mushrooms in grass
Fairy rings come from fungi feeding on buried organic matter such as old stumps, lumber and leaves. Ask yourself whether a tree once stood near the ring, or whether anyone buried wood or leaves there when the yard was built or cleared.
Dark green ring in lawn: cosmetic, not a danger to the grass
Is the ring dark green? Do the blades in it look healthier than the rest? UF/IFAS says regular mowing and good fertilizing hide the color difference. There is no long-term damage to repair, so a green ring is a looks question, and the next sections show what helps.
Dead ring in lawn: a different question
Is the grass in the ring dead? Then do not assume the fungus did it. Before patching dead areas, UF/IFAS says to find what killed them: check the sprinklers for missed or overwatered spots, and look for insects or disease. The look-alike list below helps with that.
Why Tampa's weather matters
UF/IFAS ties fairy rings to warm, rainy weather. Tampa's rainy season runs from May 25 to October 10, according to the National Weather Service Tampa Bay office. A normal year brings 49.48 inches of rain and about 94 days at 90°F or hotter (NOAA normals, Tampa airport). So note when the mushrooms show up in your yard. Do they come after summer storms?
Look-alike: chinch bugs
Check these other causes of round or patchy damage before you pay for a treatment. Chinch bug damage shows as yellow to brown patches, and in heavily infested St. Augustinegrass the center can go dead and bare. To check, look along the edge between brown and green grass for tiny black-and-white adults or orange nymphs. Our page on chinch bug damage covers this in full.
Look-alike: large patch, often called brown patch
Large patch starts as round, discolored patches that grow. The edges are darker, sometimes orange, where the fungus is active, and the center is brown and sunken. It shows up mostly when temperatures drop below 80 degrees, usually November to May in Florida. If your ring appeared in July, check the other causes too. Read about brown patch in a Tampa lawn if your patches match.
Look-alike: grubs and dry spots
Mild white grub damage leaves turf yellow and is hard to diagnose. Major damage leaves large areas of dead turf. Dry spots that stay brown often come from dry, water-repellent thatch or from runoff off high spots, according to the Washington State University Extension general lawn guide, which is not written for Florida.
Local rules
What helps a ring, and what Tampa rules apply
Mow and fertilize to hide the color difference
The UF/IFAS advice is regular mowing and good fertilizing. Tampa limits the second half. The City of Tampa bars lawn and landscape fertilizer with nitrogen or phosphorus from June 1 to September 30. No fertilizer goes within 10 feet of water, and grass clippings, fertilizer and yard waste may not be blown or placed into the street.
The soil matters too. UF/IFAS Extension Hillsborough County says urban development in Tampa and Hillsborough County often leaves compacted, nutrient-poor sandy soil. The median Florida soil pH is 6.1, and UF/IFAS says to amend only when a soil test shows a need. For-hire fertilizer applicators must hold a Limited Urban Commercial Fertilizer Applicator Certificate, so ask the applicator to show it.
Water-repellent rings and once-a-week watering
The Charlotte County article also advises a wetting agent for a ring that repels water. The Washington State University general guide says non-ionic wetting agents help water soak in and that household detergents should not be used.
Water is limited here. Tampa water customers may water lawns once a week, on a day set by the last digit of the house number, and only from midnight to 4 a.m. or from 8 p.m. to 11:59 p.m. Breaking the rules can bring fines up to $500 and a mandatory court appearance. The regional district limits apply to everyone, including homes on private wells, and the one-day-a-week order runs until March 31, 2027.
Fungicide only suppresses a ring
Fungicides only suppress fairy rings, per UF/IFAS. For lawn disease in general, the same extension service says a fungicide can be used preventively for a disease that keeps coming back, but only on areas with a known problem and never on the whole lawn. Florida has no general state landscaping licence, and for-hire fertilizing and pesticide work need their own state certificates. Ask who will apply any weed or pest treatment and which state licence they hold.
Digging near the ring: call 811 first
If anyone plans to dig, Florida law requires a call to Sunshine 811 at least 2 full business days before digging, and the locate ticket is good for 30 calendar days. Tampa Landscaping Pros pulls the City permit when the job needs one.
Patching a dead ring with sod
After you find what killed the grass, remove the dead turf and fill with plugs, sprigs or sod (UF/IFAS). UF/IFAS Extension Hillsborough County advises you never to lay sod over existing weeds and grass, and to rototill compacted soil 6 to 8 inches deep first. Spring is usually the ideal time to lay sod in Florida, though sod can root in any season if the ground is well prepared. Summer heat can quickly dry out rootless new sod.
New sod needs light, frequent watering for the first 2 to 3 weeks. Tampa still bars watering new sod between 4 a.m. and 8 p.m., and the city points to the UF/IFAS 30-day establishment schedule. Wait 3 to 4 weeks before the first mow and 30 to 60 days before fertilizing.
Check the current rule with the official source: tampa.gov
Cost
What patching a dead ring costs
These are national ranges (2026). They apply only if grass in the ring has died and needs replacing.
| Job | National range |
|---|---|
| Remove weeds and old grass, disposal included | $0.88 to $1.84 per square foot |
| Tilling and grading before new sod | $0.90 to $2 per square foot |
| St. Augustine sod, installed | $0.98 to $1.79 per square foot |
| Zoysia sod, installed | $1.04 to $1.65 per square foot |
| Bahia sod, installed | $0.77 to $1.26 per square foot |
| A pallet of sod, covering about 450 to 500 square feet | $150 to $450 per pallet |
Every line but the pallet is priced per square foot, so the size of the dead area changes the total. A ring with living grass in it needs none of this. For a wider view of what yard work runs, read the landscaping cost guide.
Ask for the written price to list each line above separately, so you can compare bids for the same work. A written estimate should list the work, the materials, the completion date and the price (FTC). Do not pay the full amount up front, and do not make the final payment until the work is done and you are satisfied.
FAQ
Is a fairy ring in my lawn harmful to the grass?
No. UF/IFAS Extension says fairy rings do no long-term damage to a lawn. Regular mowing and good fertilizing hide the color difference, and fungicides only suppress the ring.
Are the mushrooms in the circle safe around children and pets?
Treat fairy ring mushrooms as poisonous. Remove them so children and pets do not eat them.
What causes a fairy ring in a Tampa lawn?
Fungi feeding on buried organic matter such as old stumps, lumber and leaves. The ring lasts as long as that food and warm, rainy weather last. Tampa's rainy season runs from May 25 to October 10.
Can I fertilize to hide a dark green ring in summer?
Not with nitrogen or phosphorus in Tampa from June 1 to September 30. The City of Tampa bars both for lawns and landscapes in that window.
Will a fungicide get rid of a dead ring in my lawn?
It will only suppress a fairy ring, according to UF/IFAS. If the grass is dead, find the cause first by checking the sprinklers for missed or overwatered spots and looking for insects or disease.
Can I water a ring more often in Tampa?
No. Lawn watering is limited to your one assigned day, which comes from the last digit of your house number, and breaking the rules can bring fines up to $500.
Cost
Get a written price for your lawn
Call us or use the form. We call you back within one business day. The crew comes out and measures, and you get a written price before any work starts. Contact Tampa Landscaping Pros to set up the visit.