How to reseed a lawn: mow short, rake out the dead material, loosen and level the soil, spread seed evenly at the rate on the pack, then keep it lightly moist until it grows. The biggest mistake is reseeding when the soil is too cold, because warm-season grass seed won’t germinate properly until the ground warms up.
This guide explains how to reseed a lawn in Sydney, when to do it, how hydro grass seed and hydroseeding grass compare with ordinary seed, and what help costs.
Key points
- The best time to reseed a warm-season lawn in Sydney is mid spring to early summer, while cool-season grasses are best reseeded in autumn.
- You need seed that matches your existing grass, a rake, quality soil and a way to water lightly without breaking the Sydney Water Wise Guidelines.
- Check the label of any weed killer you have used, because some products stop seed germinating for a set period afterwards.
- A Sydney turf laying job typically costs about $17 to $46 per m² if you decide seed is not enough (October 2026).
When to reseed a lawn in Sydney
Seed needs warmth and moisture, so the grass type decides the season. Check what grass you have before you buy seed.
| Season | What to do | Why |
|---|---|---|
| Spring (Sep–Nov) | Reseed warm-season lawns from mid spring, once soil is warm. | Warm soil and lengthening days help seed germinate and grow quickly. |
| Summer (Dec–Feb) | Reseed early in summer only if you can water reliably. | Hot, drying winds can kill young seedlings in a few days. |
| Autumn (Mar–May) | Reseed cool-season grasses such as tall fescue or ryegrass. | Mild days and cool nights suit cool-season seed. |
| Winter (Jun–Aug) | Prepare the soil and wait for warmth before sowing. | Cold soil slows germination and encourages winter grass and bindii instead. |
What you need to reseed a lawn
| Item | What it’s for | Tip |
|---|---|---|
| Grass seed to match your lawn | Filling thin or bare areas | Check the pack for the grass type and use the rate on the label. |
| Steel rake or dethatcher | Removing dead grass and loosening the surface | Rake until you can see bare soil in the patches you want to seed. |
| Topsoil or lawn soil mix | Levelling and giving seed a good bed | Use a light dressing so you don’t smother the surviving grass. |
| Starter fertiliser (for example Scotts or Yates) | Feeding new seedlings | Use only as the product label directs. |
| Sprinkler on a tap timer, or a hose with trigger nozzle | Light, regular watering | Water before 10 am or after 4 pm unless you use smart or drip irrigation. |
| Bird netting or light mulch | Protecting seed from birds and wind | Remove netting once the seedlings are established. |
How to reseed a lawn: step by step
- Check the weather forecast and avoid reseeding before heavy rain or a hot, windy week, which can wash or dry out the seed.
- Mow the lawn shorter than usual and bag the clippings, so seed can reach the soil.
- Rake the area hard to remove dead grass and thatch, and loosen the top layer of soil.
- Consider aerating compacted areas first, where soil is hard and compacted.
- Fill low spots with a thin layer of topsoil and level the surface so water doesn’t pool.
- Apply a starter fertiliser exactly as the label directs, then spread the seed evenly at the rate on the seed pack.
- Rake the seed in gently so it is lightly covered, then press it down with a roller or the back of a rake.
- Water lightly and often so the surface stays moist, using a trigger nozzle or a timer within the Sydney Water Wise Guidelines.
- Keep children, pets and mowers off the area until the seedlings have established (indicative — check the seed pack).
- Mow for the first time when the new grass reaches the height recommended on the seed pack, using a sharp blade.
Hydro grass seed: what it is and how it works
Hydro grass seed is seed mixed into a wet slurry that you spread or spray over bare soil. The mix usually combines seed, mulch and fertiliser, which helps hold moisture around the seed.
- Check the product label to see which grass types and soil conditions the mix suits.
- Prepare the soil as for normal seed by raking, levelling and removing weeds before you apply the slurry.
- Apply it evenly according to the directions, especially along edges, paths and slopes.
- Keep the surface moist while seedlings emerge, and avoid walking on the area.
- Ask for an itemised quote if you are comparing contractors, because prices vary widely and are not in our Sydney price table.
Hydroseeding grass vs seed vs turf
| Option | Best for | Watch-outs |
|---|---|---|
| Hand-sown seed | Patching small bare areas | Slower to establish, and birds and rain can move seed. |
| Hydroseeding grass | Large areas, slopes or hard-to-reach spots | Needs consistent watering and good soil preparation. |
| Turf rolls | Instant cover and high-traffic areas | Higher cost, at about $17 to $46 per m² laid in Sydney. |
| Overseeding | Thickening a thin lawn | Needs the right grass type and season to work. |
How to reseed a lawn in shade, clay and sandy soil
Soil and light can make or break a reseed job. Heavy clay in western Sydney can turn hydrophobic in a dry spring, so loosen it before sowing.
- In shade, choose a shade-tolerant seed mix, and expect slower, patchier growth under dense trees.
- On heavy clay, rake deeply and add a thin layer of soil improver so water can soak in.
- On sandy soil, add organic matter to hold moisture, and water lightly more often.
- On slopes, use mulch or netting to hold the seed and stop rain washing it downhill.
- Under a large tree, avoid piling soil over the roots, and ask an arborist before cutting any major root.
Common mistakes with how to reseed a lawn
- Sowing before the soil is warm enough, so seed sits and rots or loses out to winter grass.
- Skipping the raking step, which leaves seed sitting on thatch rather than soil.
- Using seed that doesn’t match the existing lawn, which gives a patchy, uneven result.
- Applying weed killer without checking the label for the re-sowing wait time.
- Letting new seedlings dry out, which can kill them in a day or two of hot weather.
- Mowing too early or too low, before the roots have settled in.
When to call a gardener (or a licensed specialist)
- The whole lawn is failing, and you need advice on whether to reseed or relay with turf.
- Patches are dying or lifting like carpet, so book a licensed pest controller to check for lawn grubs.
- Weed killer is needed for a paid job, because spraying weeds for fee or reward requires a licensed ground applicator in NSW.
- Compaction is severe, and the lawn needs aerating before it can recover.
- Large trees are shading the lawn and need pruning, which is a job for an arborist with council approval where required.
- You want a fortnightly plan to mow, feed and look after the new grass.
Cost to get help with your lawn in Sydney
Prices include GST and are Sydney metro rates for October 2026.
| Job | Low | Typical | High |
|---|---|---|---|
| Gardener, per hour | $52 | $75 | $115 |
| Lawn aeration (up to about 150 m²), per job | $92 | $170 | $290 |
| Turf laying, per m² | $17 | $29 | $46 |
| Weed removal, per hour | $57 | $75 | $105 |
| Mowing, medium lawn (100–250 m²), per visit | $65 | $100 | $150 |
FAQ: how to reseed a lawn
How to reseed a lawn?
Mow short, rake out dead material, loosen and level the soil, then spread seed evenly at the label rate. Rake it in lightly, apply starter fertiliser as directed and keep the surface moist. Leave the area alone until the new grass is established.
What is hydroseeding grass?
Hydroseeding is a method that sprays or spreads a wet mix of seed, mulch and fertiliser over bare soil. The mulch holds moisture around the seed, which can help on slopes and large areas. It still needs good soil preparation and consistent watering.
Is hydro grass seed better than normal seed?
It can be easier to apply and hold moisture on slopes or bare ground, but it depends on the product and your site. Normal seed works well for small patches. Compare labels, preparation steps and itemised quotes before you decide.
When is the best time to reseed a lawn in Sydney?
Reseed warm-season lawns in mid spring to early summer once the soil is warm, and cool-season lawns in autumn. Avoid winter, when cold soil slows germination, and avoid the hottest weeks of summer unless you can water reliably.
Getting your lawn reseeded in Sydney
If you would rather someone else handled the raking, seeding and aftercare, we can prepare the soil and look after the new grass as it grows. Read our lawn care guide for the full year-round routine, or book lawn care in Sydney, and check what time you can mow before the first cut.
