When to fertilise lawn in Sydney: feed warm-season lawns such as buffalo, kikuyu, couch and zoysia in spring and again in early autumn, while the grass is actively growing. The biggest mistake is feeding a dormant winter lawn or a stressed, dry one, which wastes product and can burn the grass.
This guide gives a season-by-season calendar, a step-by-step method, advice for buffalo lawns and what lawn care costs. It is part of our wider lawn care guide.
Key points
- Best time in Sydney: spring (September to November) and early autumn (March to April), when warm-season grass is growing and soil is warm.
- You need a spreader and a fertiliser registered for lawns, used exactly as the label directs.
- Safety: keep children and pets off until the label says it is safe, and keep granules out of drains and off hard surfaces.
- A Sydney mowing visit typically costs about $100 for a medium lawn (range $65 to $150) including GST, as at October 2026.
When to fertilise lawn in Sydney: season by season
Match the feed to your grass type, because warm-season and cool-season lawns grow at different times.
| Season | What to do | Why |
|---|---|---|
| Spring (Sep to Nov) | Main feed for buffalo, kikuyu, couch and zoysia once new growth shows | Soil is warming and grass uses nutrients quickly. |
| Summer (Dec to Feb) | Light top-up only if the label allows; skip heatwaves and dry spells | Heat stress and watering limits raise the risk of burn and runoff. |
| Autumn (Mar to May) | Second feed early in autumn to build strength before winter | Roots are still active and recover before dormancy. |
| Winter (Jun to Aug) | Don’t feed dormant warm-season lawns | The grass can’t use nutrients, and rain can wash them away. |
| Cool-season lawns such as tall fescue | Feed in autumn and spring instead | These grasses grow most in cooler months. |
What you need to fertilise a lawn
The kit is simple, but the right product matters more than the brand.
| Item | What it is for | Tip |
|---|---|---|
| Lawn fertiliser | Feeds the grass and keeps colour | Choose one labelled for your grass type; slow-release products suit most Sydney lawns. |
| Spreader | Applies granules evenly | Even coverage prevents stripes and burn. |
| Gloves and eye protection | Protect you while handling product | Wear the protective gear listed on the label. |
| Hose with trigger nozzle | Waters in the product | Hand-held hoses need an instant on-off trigger nozzle. |
| Broom | Sweeps granules off paths | Return stray granules to the lawn so they don’t wash into drains. |
| Named boosters (for example 2Spec Accelerate from Bunnings) | Liquid or granular lawn boosters | Treat any product name as an example only and check the current label for rates and grass types. |
How to fertilise lawn: step by step
Follow these steps alongside the product label, which sets the rate for your lawn.
- Confirm your grass type, then choose a fertiliser labelled for it; our guide to identifying your grass type helps if you aren’t sure.
- Mow the lawn a day or two beforehand and remove clippings from paths, so the fertiliser reaches the soil.
- Check the forecast and avoid applying before heavy rain, which can wash product into drains.
- Measure the lawn area and read the label for the rate, then set the spreader to match (indicative — check the product instructions).
- Wear the gloves and eye protection the label lists, and keep children and pets inside.
- Spread evenly in overlapping passes, avoiding paths, garden beds and drains, and sweep stray granules back onto the lawn.
- Water in only as the label directs, before 10 am or after 4 pm, using a trigger nozzle and no runoff onto hard surfaces.
- Keep children and pets off until the label says it is safe, and note the date so you don’t feed again too soon.
Can you fertilise lawn after mowing?
Yes, and mowing first usually gives the best result.
- Mow first so the granules reach the soil rather than sticking to long leaves.
- Wait until the lawn is dry, because wet grass holds granules on the leaf and can burn.
- Collect clippings if the lawn is thick, or let them fall if the mulch layer is thin.
- Avoid mowing straight after fertilising and watering in unless the label says it is safe.
- Keep to the NSW noise hours: 7 am to 8 pm on weekdays and Saturdays, and 8 am to 8 pm on Sundays and public holidays; see our what time can you mow guide.
How often to fertilise lawn
Most home lawns need only a few feeds a year, and more is not better.
- Warm-season lawns usually need a couple of feeds a year (indicative — check the product instructions).
- Slow-release products usually last longer between applications than quick-release liquids.
- Shaded lawns need less fertiliser than sunny lawns because they grow more slowly.
- Thin or patchy lawns often benefit from aeration first; see our guide to how to aerate a lawn.
- Check for signs of overfeeding, such as soft, fast growth or yellow burn patches, before adding more.
When to fertilise buffalo lawn and Sir Walter lawn care
Buffalo lawns respond well to spring and autumn feeding, but each variety can differ.
- Feed buffalo, including Sir Walter, in spring once growth starts, and again in early autumn if the lawn is thin.
- Choose a fertiliser labelled for buffalo, since some weed-and-feed products can damage certain varieties.
- Lawns under jacarandas in the Inner West need less feeding because shade slows growth.
- Water in within Water Wise hours, and avoid feeding during heatwaves.
- Mow at the height the turf supplier advises (indicative — check the turf instructions), and keep blades sharp.
Common mistakes when you decide when to fertilise lawn
- Feeding a dormant winter lawn, which can’t use the nutrients and leaches them away.
- Applying more than the label allows, which burns the grass and pollutes waterways.
- Fertilising before heavy rain, so granules wash off the lawn and into stormwater.
- Spreading unevenly by hand, which leaves dark stripes and pale patches.
- Skipping watering rules and hosing granules off paths onto hard surfaces.
- Feeding a patchy lawn without fixing compaction, shade or poor drainage first.
When to call a gardener or licensed specialist
- Your lawn is large, and spreading by hand takes longer than a fortnightly maintenance visit costs.
- You need paid weed spraying; spraying for fee or reward requires an EPA ground applicator licence, though routine lawn maintenance has an exemption.
- You’ve seen lawn grubs or insect damage; book a licensed pest controller rather than treating it yourself.
- Patches won’t recover despite feeding, which points to compaction, shade, disease or poor drainage that fertiliser can’t fix.
- Large trees overhang the lawn and need pruning; engage a qualified arborist and check council rules.
- You want a regular mowing and feeding schedule without thinking about it.
Lawn care cost in Sydney
These prices include GST and are current for October 2026; feeding is usually quoted with a maintenance visit, so ask for it itemised.
| Job | Low | Typical | High |
|---|---|---|---|
| Mowing, small lawn up to 100 m² | $45 | $60 | $100 |
| Mowing, medium lawn 100 to 250 m² | $65 | $100 | $150 |
| Mowing, large lawn 250 to 500 m² | $90 | $140 | $210 |
| Fortnightly maintenance, medium lawn | $60 | $75 | $120 |
| Aeration, up to about 150 m² | $92 | $170 | $290 |
| Gardener, per hour | $52 | $75 | $115 |
FAQ: when to fertilise lawn
When should I fertilise my lawn in Sydney?
Feed warm-season lawns in spring once growth starts, and again in early autumn. Skip winter, when the grass is dormant, and avoid heatwaves and dry spells. Cool-season lawns such as tall fescue are fed in autumn and spring. Always follow the label for rates and timing.
Can you fertilise lawn after mowing?
Yes. Mow first, wait until the grass is dry, then spread the fertiliser evenly so it reaches the soil. Water in only as the label directs and within Water Wise hours. Avoid mowing again straight away unless the label says it is safe.
How often should you fertilise a lawn?
Most home lawns need only a few feeds a year, depending on the product and grass (indicative — check the product instructions). Slow-release fertilisers last longer between applications. Feeding more often doesn’t improve results and can burn the grass or wash nutrients into stormwater.
When is the best time to fertilise buffalo lawn?
Spring, once the buffalo is actively growing, is the best time, with a second light feed in early autumn if the lawn looks thin. Use a product labelled for buffalo, avoid feeding in winter, and keep children and pets off until the label says it is safe.
Getting your lawn looked after in Sydney
If you’d rather not juggle spreaders and weather forecasts, or guess when to fertilise lawn each season, we can mow, edge and look after your lawn on a regular schedule. Tell us your lawn size and grass type, then book lawn mowing in Sydney and we’ll quote it in writing.
