How do you get grass to grow over a ground stump?
Clear fresh grindings out of the seedbed, mix soil into the spot rather than spreading it on top, and seed in the grass's season. NC State Extension says soil microbes breaking down high-carbon material use nitrogen and that fresh organic matter settles as it decays; its gardener handbook puts the best cool-season seeding at mid August to early October, depending on location.
Fresh grindings come out first: decaying wood draws on nitrogen
Fresh grindings are wood, heavy on carbon and light on nitrogen. NC State Extension's composting guide lists wood chips and sawdust at 100 to 500 parts carbon to one of nitrogen, against 15 to 25 for grass clippings and an ideal of 25 to 35 for a compost pile.
The Extension Gardener Handbook says "Soil microbes use nitrogen during decomposition and may deprive plants, resulting in slow or stunted plant growth," and lists a nitrogen shortage as reduced growth and "Light-green to yellow foliage (chlorosis)."
Whether grindings are returned to the hole or removed is settled with the job; stump grinding cost describes two public finishes.
Soil goes in mixed, and the spot settles as wood decays
Soil does better worked into the spot than spread on top: NC State's SoilFacts says topsoil or other amendments "should be tilled into the existing soil, rather than placed on top of existing soil." It adds that "there are no legal standards for topsoil."
The spot sinks as the wood in it breaks down: SoilFacts says "fresh organic materials will settle as they decompose." A dug-out stump leaves a different hole; the comparison is drawn in stump grinding vs stump removal.
Seed in the grass's own season
The Extension Gardener Handbook puts the best cool-season seeding at mid August to early October, depending on location, and the piedmont's best dates for tall fescue at September 1 to 15; warm-season grasses may be seeded successfully between March 1 and July 1, depending on species and location.
The grind that comes before the seed is the work described on stump grinding and removal.
When was the stump ground, and what is in the hole now?
Questions people actually ask.
Will bermudagrass or zoysia close over the spot without seed?
Bermudagrass and zoysiagrass spread by stolons and rhizomes, the Extension Gardener Handbook says, but only smaller bare areas tend to fill in naturally; tall fescue is a bunch-type grass whose bare areas need to be re-seeded.
How is a small stump spot seeded by hand?
The Extension Gardener Handbook's steps: loosen the soil with a rake, hoe or shovel, fill low areas, smooth out clods larger than marbles, rake the seed in lightly, and roll lightly for seed-to-soil contact.
Does the spot need lime or feeding before it is seeded?
A soil test decides that. NC State Extension says proper soil testing reveals nutrient amounts and types, and the county Cooperative Extension center has soil test boxes and instructions.
Is spring seeding worth trying on a tall fescue spot?
The Extension Gardener Handbook calls spring or late-winter seedings of cool-season grasses often less than satisfactory: seedling roots have too little time to take hold before summer heat and drought.