Seedlings that collapse at the soil line in a new lawn are what the Washington State University (WSU) Extension home lawn guide calls damping off. The guide says to prevent it with a good seedbed, no overwatering and treated seed. That guide is written for lawns in general, not for Florida. Change the watering first, since the guide ties damping off to overwatering; the reseed itself can wait for the April-to-July window UF/IFAS gives for seeding warm-season grass in most of Florida.
Fixing it starts with finding what went wrong with the water, the soil or the seedbed, then seeding again in season. Hydroseeding costs $0.06 to $0.20 a square foot nationally, according to the This Old House hydroseeding guide updated in 2026. Your Tampa price comes from a written quote after the crew comes out and measures.
How to tell damping off from seed that never took
Seedlings collapsing at the soil line
Damping off makes new seedlings collapse at the soil line. The picture is a lawn where grass came up and then folded over, not a bare bed where nothing ever showed. Count the days since the seed went down before you decide anything.
This Old House says hydroseeded grass can sprout in as little as 7 to 10 days, depending on the grass. That is a general figure, and warm-season Florida grasses may differ. The same guide puts the first mow about 4 weeks out and a hardy, healthy lawn at about 2 months. A traditionally seeded lawn takes 6 to 10 weeks to become fully established and usable.
New lawn seed not growing: check the calendar and the grass
UF/IFAS says to seed warm-season grass between April and July in most of Florida, so it has a full growing season before cold weather. If your seed went down outside that window, put that on your list of questions for whoever did the work.
The grass matters too. UF/IFAS lists bahiagrass and bermudagrass as the Florida lawn grasses to start from seed, while St. Augustinegrass and zoysiagrass go in as sod or plugs. Ask what grass is in the mix and whether it is one that goes in from seed.
Grass seed rotting or patches going bare
If seed or seedlings seem to be rotting in a wet bed, start with the water. The guide ties damping off to overwatering. UF/IFAS adds advice for any dead area: find what killed it before you patch it. Check the sprinklers for missed or overwatered spots, and look for insects or disease. Most Florida lawn diseases are fungi, according to UF/IFAS.
Local conditions
What goes wrong with water, drainage and soil in a Tampa yard
Too much water, from the sprinkler or the sky
Overwatering is the cause WSU names. In a Tampa yard the water comes from two places.
The first is your sprinkler. This Old House says to water a hydroseeded lawn 2 to 3 times a day for the first few weeks, then less, but still more than usual, for the next 6 to 7 weeks. Tampa's order is different. The City of Tampa Water Department lets water customers water lawns once a week, on a day set by the last digit of the house number. Watering is allowed only from midnight to 4 a.m. or 8 p.m. to 11:59 p.m., and properties of one acre or more may use both windows on their day. Hillsborough County reports that the one-day-a-week order runs until March 31, 2027, and the water district says it applies to homes on private wells too.
The city page spells out a rule for new sod, which may not be watered between 4 a.m. and 8 p.m. For new seed, ask the water department what applies before you set a schedule.
The second source is rain. Tampa gets 49.48 inches a year, and 30.24 inches of it falls from June through September, about 61% of the total. The National Weather Service puts the rainy season in the Tampa Bay area from May 25 to October 10, so the later part of the April-to-July seeding window falls inside it. UF/IFAS says that after 0.3 inch of rain in 24 hours, or 1 inch in 3 days, irrigation may not be needed that day.
Soil that holds water or drains poorly
UF/IFAS describes many Florida flatwoods soils as having a weakly cemented organic hardpan, usually 12 to 40 inches down, with a water table that rises to within 5 to 20 inches of the surface. The USDA's description of Myakka fine sand, Florida's state soil, calls it poorly or very poorly drained, with the water table less than 18 inches down for 1 to 4 months in most years. Both are statewide descriptions, not a survey of your lot.
UF/IFAS Extension in Hillsborough County adds that urban development in Tampa and Hillsborough County often leaves compacted, nutrient-poor sandy soil. A quick check from UF/IFAS: if you struggle to push a tool more than a few inches into the soil, the root zone is likely compacted. WSU says surface water that has not drained 2 or 3 hours after rain or watering points to a drainage problem. If water sits after rain, read our guide to water that will not drain.
A seedbed that was not prepared
The WSU guide lists the seedbed first. For Florida lawns, UF/IFAS site preparation means clearing debris, roots and rocks, killing and removing the old grass, getting a soil test through the county Extension office, and grading the soil to slope away from the house. UF/IFAS Hillsborough County puts the grade at 1% to 2% away from buildings or toward drains. For hydroseeding, This Old House says to grade the soil about 2.5 to 3 inches below the final grade you want.
The soil test matters because North and Central Florida soils are typically very sandy and do not hold water or nutrients well. The median Florida soil pH is 6.1, and most plants take up nutrients best between pH 6 and 7. UF/IFAS says to amend the soil only when a test shows a need.
Seed that was not treated
Treated seed is the third item on the WSU prevention list. Ask any company whether the seed going into your lawn is treated, and whether it is bahiagrass or bermudagrass, the Florida lawn grasses UF/IFAS lists for seeding. Ask for the seed type and the pounds of seed per 1,000 square feet in writing before anyone sprays.
Checklist
What to check first, and what a Tampa reseed costs
What to check this week, and what to leave alone
Before anyone reseeds, work through these in order.
- Count the days since seeding against the sprout and mow dates above.
- Write down when you water, how often, and for how long. Tampa fines for breaking the watering rules can reach $500 with a mandatory court appearance, and a citation can be issued on first observance.
- Look for ponding and test the ground with a tool, as described above.
- Keep people and pets off the new lawn.
- Check the date before you fertilize. In Tampa, lawn and landscape fertilizer with nitrogen or phosphorus may not be applied from June 1 to September 30.
UF/IFAS gives general advice for Florida lawn diseases: water only when leaf blades curl, do not mow wet grass, use the least nitrogen the grass needs, and aerate to cut compaction. It says fungicides can be used preventively for a disease that keeps coming back, but only on areas with a known problem, never the whole lawn. In Florida, anyone applying pesticide to lawns for hire needs their own state FDACS certification or must work under a licensed Lawn and Ornamental operator. Ask who will apply any weed or pest treatment and which state licence they hold.
If the fix means digging, such as regrading, Florida law requires a call to Sunshine 811 at least 2 full business days before the dig. The locate ticket is good for 30 calendar days.
What a reseed involves and what it costs
A reseed repeats the preparation steps once the cause is fixed: clear the bed, grade it, test the soil, then seed in the April-to-July window. Hydroseed slurry is grass seed, mulch, water and fertilizer, often with biostimulants and a green dye, and the mulch helps bond the seed to the soil, says This Old House. After spraying, the watering schedule and the Tampa rules above decide the next weeks. See how hydroseeding is done for the full process.
Sod is the other route. UF/IFAS says spring is usually the ideal time to lay sod in Florida, though sod can root in any season if the ground is well prepared. This Old House puts the cost of sodding a 1,000-square-foot lawn at $250 to $620 more than hydroseeding it. These are national figures:
| Item | National range |
|---|---|
| Hydroseeding | $0.06 to $0.20 per square foot |
| Hydroseeding job minimum | $300 to $500, however small the job |
| Soil test before seeding | $35 to $100 |
| Removing weeds and old grass, disposal included | $0.88 to $1.84 per square foot |
| Reslope a yard before hydroseeding | $700 to $2,500 |
What moves the price: the job minimum applies however small the lawn, and a soil test, old-grass removal or reslope each add their own line. Ask for a price per square foot and the job minimum before the crew sprays. For the wider picture, see our cost guide for Tampa landscape work. Tampa Landscaping Pros pulls the City permit when the job needs one.
Questions about new seedlings dying
Why are my new grass seedlings dying?
Seedlings that collapse at the soil line fit what the WSU guide calls damping off, which it links to overwatering and a poor seedbed. Check the watering and the drainage first, then ask whether the seed was treated.
Why is my new lawn seed not growing?
Start with the calendar. Hydroseeded grass can sprout in 7 to 10 days, depending on the grass, and UF/IFAS puts the seeding window for warm-season grass at April to July in most of Florida. Then check the grass type and how much water the bed has had.
How much can I water new seed in Tampa?
Tampa limits lawn watering to once a week on a day set by your house number, from midnight to 4 a.m. or 8 p.m. to 11:59 p.m. Ask the water department how that order applies to new seed.
Can I fertilize or spray to save the seedlings?
Not with nitrogen or phosphorus fertilizer between June 1 and September 30 in Tampa. UF/IFAS says to use fungicide only on areas with a known problem, never the whole lawn, and the person applying it needs the right state certification.
What does reseeding cost in Tampa?
Hydroseeding runs $0.06 to $0.20 a square foot nationally, with a national job minimum of $300 to $500. Ask for a price per square foot and the job minimum before the crew sprays.
Cost
Get a written price to reseed your lawn
Call us or use the form. We call you back within one business day. The crew comes out and measures, and Tampa Landscaping Pros gives you a written price before any work starts.