Your lawn is growing again, so get back in the garden and see what has recovered after the dry summer. Cooler, wetter conditions often bring established grass back from dormancy and reveal the patches that still need seed.
Start with gentle jobs where conditions allow. Once recovery is clear, overseed only the patches that remain genuinely thin or bare. If the whole lawn needs attention, begin with our guide to reviving a lawn after drought.
Before you start
- Green shoots returning? Give the lawn more time.
- Still genuinely bare or thin? Overseed when conditions are suitable.
- Ground hard, sticky, waterlogged or impossible to keep moist? Wait.
When should you overseed?
Early autumn is often a good time to overseed in the UK. The soil may still be warm enough for germination, while cooler weather and rainfall can help young grass establish.
Before starting, check that:
- Fresh growth is visible in the existing lawn.
- The soil is moist and workable, not hard, sticky or waterlogged.
- The grass surface is dry enough to mow and rake.
- The seed will have time to establish before hard frost.
If conditions are unsuitable, or you cannot keep new seed moist within current local water rules, postpone the work. Spring is a sensible alternative; continue gentle mowing and leaf clearance while growth and ground conditions allow.
1. Check which patches really need seed
Brown grass with green shoots at its base is recovering and may fill out without reseeding. Concentrate on areas that remain genuinely bare or thin.
Check why the damage happened. Heavy foot traffic, shade, compacted soil and poor drainage can all cause bare patches, and grass seed alone will not correct the underlying problem.
2. Give the lawn a gentle cut
Mow when the surface is dry and the grass is actively growing. Use a sharp blade, choose a higher cutting setting and remove no more than one-third of the grass height.
For small to medium lawns, the HY40CLM38 40V (2x20V) cordless lawnmower offers five cutting heights from 20mm to 65mm and a 36L collection bag, making it suitable for a higher recovery cut.
Collect long or damp clippings so they do not cover the seed. Avoid cutting newly recovering grass short.
3. Prepare the surface
A hand rake is enough for one or two small patches. For several or larger areas, a suitable Hyundai scarifier or raker, such as the HYSC1600E electric scarifier and raker, can make surface preparation faster and more even. Remove loose dead material and lightly loosen the surface so seed can touch the soil without disturbing healthy roots.
Where a wider area has a genuine layer of moss or thatch, begin with a shallow test strip and make one light pass while the lawn is actively growing, the soil is moist but firm and the surface is dry. Not sure whether the lawn is ready? Read our guide to how and when to scarify a lawn.
Deeply compacted ground may need a garden fork or hollow-tine tool after the soil has softened. Scarifying and core aeration are different jobs; our scarifier vs aerator guide explains which problem each one solves.
Never use powered machinery on waterlogged ground or over newly sown patches. If you use a powered machine, follow the manual, wear sturdy footwear and the specified eye and hearing protection, and keep children, pets and bystanders clear. With a corded machine, use a suitable outdoor lead and RCD protection, keep the cable clear of the tines, and switch off and disconnect before adjusting or clearing it.
4. Choose seed for the site
Use a quality lawn-seed mixture suited to the conditions in your garden, whether that is shade, family use, a fine finish or regular wear.
For a lawn that often struggles in dry weather, consider a mixture described as suitable for drier conditions, often with a higher proportion of suitable fescues. No grass seed is drought-proof, so follow the coverage and sowing rate on the pack.
5. Sow evenly
Spread half the seed in one direction and the other half at right angles. Lightly rake afterwards so the seed touches the loosened soil. Do not bury it deeply.
A thin layer of suitable lawn top dressing can improve seed contact, but it should not smother the existing grass.
6. Keep new seed suitably moist
New seed needs consistent moisture while it germinates and establishes, but the ground should not become saturated.
Use forecast rain and stored rainwater where practical. If extra watering is needed, check your local supplier’s current hosepipe or temporary-use restrictions first. Apply water gently so it does not wash the seed into piles. If you cannot provide the required moisture legally and reliably, delay sowing.
7. Protect the new grass
Keep people and pets off newly seeded patches where possible. Wait until the grass is established and has reached the mowing height stated for the seed mixture before making the first cut.
Use a sharp blade and a high setting, removing no more than one-third of the new growth. Let the new grass establish before applying fertiliser or weedkiller, and follow the seed and treatment labels for timing.
Get back in your garden, repair only the patches that need it and let the weather decide when to sow.
Tools for the job: the products below are optional preparation tools for larger patchy lawns. A hand rake is enough for one or two small areas.
