By Bestcare Gardeners (bestcaregardeners.co.ke)
Lawns naturally thin out over time from foot traffic, weather stress, pests, or old age, leaving bare or sparse patches scattered across otherwise healthy turf. Overseeding fills those gaps in, introducing new grass seed directly into an existing lawn without tearing it all up and starting over.
How Overseeding Works
Grass seed is spread across the existing lawn, usually right after aeration or dethatching, since freshly opened soil gives seed better contact with the ground and a higher chance of germinating successfully. Seeding into a lawn with heavy thatch or compacted soil rarely works well, since the seed just sits on top without reaching soil it can root into.
Once spread, the seeded area needs consistent watering to keep it moist while germination takes place, along with light foot traffic restrictions until the new grass is established enough to handle regular use.
When Overseeding Makes Sense
Thinning patches, bare spots from heavy use, and lawns that have gradually lost density over the years are all good candidates for overseeding. It's also useful after pest damage or disease has wiped out sections of grass, giving those areas a way to recover without needing a full reinstallation.
Choosing the Right Seed
Matching new seed to the existing grass variety keeps the lawn looking uniform once it fills in. Mixing incompatible grass types can create a patchy, uneven appearance, with different textures and colors standing out against each other rather than blending into one consistent lawn.
Timing for Best Results
Overseeding works best just ahead of or during the rainy season, when natural moisture supports germination without requiring constant manual watering. Attempting it during the dry season usually means a much heavier watering commitment to keep the seed from drying out before it takes root.
Estimated Overseeding Costs
| Service | Estimated Cost (Nairobi) | Estimated Cost (Kenya, other regions) |
|---|---|---|
| Spot overseeding (small patches) | KSh 1,000 – 2,500 | KSh 900 – 2,200 |
| Full lawn overseeding (per 100 sq. meters) | KSh 3,000 – 7,000 | KSh 2,600 – 6,300 |
| Overseeding with aeration combo | KSh 5,000 – 12,000 | KSh 4,500 – 10,500 |
| Premium grass seed upgrade | KSh 1,500 – 4,000 extra | KSh 1,300 – 3,500 extra |
| Post-seeding care visit | KSh 1,000 – 2,000 | KSh 900 – 1,800 |
Costs depend on the size of the area being seeded, the grass variety chosen, and whether it's paired with aeration or dethatching beforehand.
Getting Started
Bestcare Gardeners identifies thin or bare areas and matches seed type to the existing lawn before scheduling overseeding around the season most likely to give strong results.