Hydroseeding in Greenville, SC

Hydroseeding in Greenville is the practice of spraying seed, wood fiber mulch, fertilizer and a tackifier together as one wet mix onto prepared soil, so a lawn or a slope can root fast, before the next storm moves the dirt. Greenville sits in the foothills of the Blue Ridge, and the city takes in many small hills, with Paris Mountain rising about 8 miles north of downtown and the Reedy River cutting through the center of town. Those hills, a long growing season and plenty of rain shape every job we price. We hydroseed new lawns, cover cut banks and pond slopes, put up silt fence and inlet protection, fine grade and spread topsoil, and renovate thin lawns across Greenville County and the neighboring Upstate counties.

The clay under the grass

Much of the Piedmont from Virginia to Alabama, South Carolina included, is mapped as Cecil soil. A typical Cecil profile has a few inches of brown sandy loam on top and then red, sticky clay that runs two to four feet deep. Decades of farming and erosion stripped the topsoil off a lot of that ground before houses were built on it, and grading on a new lot usually scrapes away whatever was left. Kaolinite clay like this has little ability to recover from compaction once heavy equipment has driven over it. That is why we rip or till packed ground, add topsoil where the clay is bare and work in lime and starter fertilizer before seed ever goes down. Clemson Extension suggests adding up to 3 inches of topsoil on clayey or eroded ground, and pulling a soil test 2 to 3 months before planting when there is time.

Rain is the clock

The 1991 to 2020 normals at Greenville-Spartanburg International put yearly precipitation at 49.67 inches, spread over about 117 days with measurable rain. July and August are the wettest months, at 4.82 and 4.66 inches, and summer rain tends to arrive as short, heavy thunderstorms. On a freshly graded slope, one of those storms can cut rills in an afternoon. A hydroseed slurry helps because the wood fiber mulch and tackifier glue the seed and the surface together, and the mulch holds moisture against the seed while it germinates. On steeper ground we go further, pinning down erosion control blankets or spraying a bonded fiber matrix, and on the low side of the work we set silt fence or inlet protection so mud stays on the lot instead of in the street or the nearest creek.

When to seed which grass

Greenville averages a freeze-free window of about 217 days, running roughly from April into early November, and the city falls in USDA hardiness zone 8a/8b. That long season lets us grow two different kinds of lawn. Clemson Extension sets a target of May 1 to 14 for seeding warm-season grasses anywhere in South Carolina, and mid to late September for cool-season grasses like tall fescue. Seed bermuda too early and cool soil slows it and invites seed rot. Seed it too late and it has to fight July heat as a seedling. Fescue sown in late September has the fall and the next spring to build roots before its first summer. Only some warm-season grasses can be grown from seed at all: common and improved bermuda, centipede and Japanese zoysia can, while many other zoysia and St. Augustine varieties have to go in as sod, plugs or sprigs. We will tell you which group fits your sun, shade and foot traffic before we mix a tank.

Sod, hydroseed or dry seed

Each method has a place. Sod looks like a finished yard the moment the last roll goes down, and Clemson notes it can be installed almost any time of year in South Carolina, though mid to late spring and fall are best. It also costs far more per square foot and needs heavy watering in summer. Dry seed broadcast with a spreader is the cheapest way to cover ground, but on clay it washes, birds find it, and it usually needs straw on top. Hydroseeding sits in between. It costs a little more than dry seed and generally less than sod, the fiber mulch holds the seed down and stops it drying out, and grass usually shows within 5 to 7 days in good conditions, versus two to three weeks for dry seed. On a large yard or a slope, hydroseeding is usually the practical choice. On a small strip next to a driveway that needs to look finished this weekend, sod may be the better buy, and we will say so.

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Water, mud and the rules

The Reedy River rises in the foothills northwest of the city and runs south through downtown, through Lake Conestee Nature Park and on to the Saluda at Lake Greenwood. The Enoree, the Saluda and the South Pacolet also drain parts of the county. Local governments take runoff from construction seriously: Greenville County's stormwater ordinance has its own division on grading and sediment control, and some cities, Easley among them, ask even small sites disturbing less than an acre to file a stormwater permit application listing the erosion and sediment controls they will use. When your builder, the county or a city inspector needs a lot stabilized, we plan the silt fence, the seed and the mulch together so the cover comes in quickly and the fence comes out when it is no longer needed.

What a job looks like

• A site visit to check slope, drainage, access for the truck and where runoff leaves the property
• A written estimate broken out by prep, topsoil, seeding and erosion control
• Grading, ripping or tilling the clay, and topsoil where it is needed
• Hydroseeding with a mix matched to the season, plus blankets or BFM on steep ground
• Silt fence or inlet protection on the low side when water has somewhere to go
• A watering plan: short, light soakings several times daily over the first two to three weeks, then deeper and less often

After the spray

New hydroseed is green from the colorant, not from grass, so give it a week or so before judging. Keep the surface damp, not soaked, and keep dogs and kids off it. Mow for the first time once the seedlings are about a third taller than your normal mowing height, with a sharp blade so the young plants are cut instead of pulled. Wait as long as you can before spraying any weed killer, since most herbicides can hurt newly germinated grass. If a storm washes a patch out in the first couple of weeks, call us and we will look at it.

Most of our work is in Greenville County: the city itself, Greer, Taylors and Travelers Rest to the north and east, and Mauldin, Simpsonville, Five Forks and Fountain Inn along the I-385 corridor, where new subdivisions keep turning out bare lots. West of the Saluda we cover Easley, Powdersville, Piedmont and Pelzer, plus Pickens, Liberty, Clemson and Anderson out toward the lakes and the mountains. East of Greenville we work in Spartanburg, Duncan, Lyman, Boiling Springs, Inman and Woodruff. The ground changes as you go: steeper foothill lots near Travelers Rest and Pickens, old mill sites along the Saluda, creek-side yards on the Enoree, and big warehouse pads along I-85. Open the page for your town to read about its own soil, water and slopes, and which county's rules govern the work there.