The best way to kill weeds in lawn is to identify the weed first, then use a selective lawn herbicide labelled for your grass type or pull the weeds by hand while the soil is moist. The biggest mistake is spraying a non-selective product across the whole lawn, which kills the turf as well.
This guide explains how to kill weeds in lawn in Sydney, how to get rid of weeds in lawn without damaging your grass, what to buy and when a professional makes sense.
Key points
- Spring and early autumn are the best times in Sydney, because weeds are actively growing and your lawn can fill the gaps afterwards.
- You need a selective herbicide labelled for your turf variety, or a hand weeder and a sharp mower, and you must follow the label exactly.
- In NSW, anyone who sprays weeds for fee or reward needs an EPA ground applicator licence, though routine garden maintenance has an exemption.
- Weed removal by a Sydney gardener typically costs about $57 to $105 per hour (October 2026).
How to kill weeds in lawn: when to start in Sydney
Timing matters more than the product. Weeds that are young and growing fast take up treatment far better than tired, seeding plants.
| Season | What to do | Why |
|---|---|---|
| Spring (Sep to Nov) | Treat broadleaf weeds and pull young plants before they flower. | Warm-season turf wakes up and fills bare patches quickly. |
| Summer (Dec to Feb) | Spot treat only, and avoid spraying in extreme heat or before storms. | Stressed lawn can burn, and humid weather drives runoff. |
| Autumn (Mar to May) | Hit winter grass and cool-season weeds before they seed. | Seedlings are small and easy to control. |
| Winter (Jun to Aug) | Hand pull, mow regularly and plan any spring renovation. | Warm-season lawns are dormant and slow to recover from herbicide. |
In the Inner West we often see winter grass seeding through tired buffalo in August, which is a sign the autumn window was missed.
What you need to kill weeds in lawn
| Item | What it is for | Tip |
|---|---|---|
| Selective lawn herbicide | Kills listed weeds without harming the named turf types | Check that your grass variety is on the label, because some products harm buffalo or kikuyu. |
| Hand weeder or fork | Removes tap-rooted weeds such as dandelion and cudweed | Pull after rain so the whole root comes out. |
| Pump sprayer | Applies liquid products evenly | Keep one sprayer for herbicide only and rinse it away from drains. |
| PPE | Protects skin, eyes and lungs | Wear exactly what the product label lists, usually gloves, long sleeves and eye protection. |
| Mower | Stops weeds seeding and keeps turf dense | Mow at the height your grass type prefers (indicative — check the turf supplier’s advice). |
| Bags or bin | Disposes of pulled weeds and seed heads | Bag seeding weeds rather than composting them. |
How to kill weeds in lawn: step by step
- Identify the weed by photographing the leaf shape, flower and growth habit, then compare it with our common lawn weeds guide or ask a local nursery.
- Confirm your lawn variety, because buffalo, kikuyu, couch and zoysia each tolerate different products (indicative — check the product label).
- Mow the lawn a day or two before you treat, so weeds have enough fresh leaf to take up the herbicide.
- Check the forecast and choose a calm, dry day, as spray drift and rain wash-off cause most herbicide failures.
- Put on the PPE listed on the label, and keep children and pets inside until the label says the area is safe.
- Apply the selective product exactly as the label directs, with no extra strength and no mixing of products, and keep it away from drains and garden beds.
- Hand pull isolated weeds with the root intact, and fill the hole with a pinch of soil and a little turf seed or runner.
- Wait before mowing as the label advises, then water in line with Sydney Water’s Water Wise Guidelines, which allow hand watering before 10 am or after 4 pm.
- Re-check after a few weeks (indicative — check the product instructions), and repeat only if the label allows a second application.
How to get rid of weeds in lawn by weed type
Different weeds need different tactics, so match the method to what is actually growing. Our common lawn weeds guide helps with identification.
Broadleaf weeds
- Clover, dandelion, plantain and cudweed respond to a selective broadleaf product used on actively growing plants.
- Hand pull dandelion while the soil is damp, because snapped tap roots regrow.
- Spot treat patches rather than the whole lawn, which protects soft-leaf turf such as buffalo.
- Thick weeds such as pennywort thrive in wet, shaded spots, so fix drainage as well as spraying.
- Mow often to stop flower heads forming and seeding.
Grassy weeds and runners
- Winter grass, crabgrass and paspalum need a product that targets grass weeds, and many harm desirable turf, so read the label carefully.
- Kikuyu creeping into garden beds on the Northern Beaches is best cut back by hand along the edge.
- Bulb weeds such as onion weed return unless the bulbs come out, so dig the clump and bin it.
- Non-selective sprays suit paths and cracks only, as they also kill the lawn they touch.
- Thicken the lawn with regular feeding and mowing so seedlings cannot find light.
New turf and established lawn
- Newly laid turf is sensitive, so hand pull weeds for the first season rather than spraying.
- Established lawn tolerates selective products if the label lists your variety.
- Patchy lawn invites weeds, so reseed or patch bare spots before they colonise.
- Shady lawns under trees thin quickly, which lets moss and broadleaf weeds in.
- Clay soil in western Sydney stays wet and compacted, so aerate before you expect herbicide to do all the work.
Natural options to kill weeds in lawn
- Vinegar, boiling water and salt are non-selective and burn nearby turf as well as the weed.
- Salt and bleach damage the soil for a long time, so avoid them on or near lawn.
- Boiling water suits cracks in paths, not lawn, and it can scald your feet and plants.
- Hand weeding and good mowing are the safest chemical-free options for most home lawns.
- Our natural weed control guide compares these methods in detail.
Common mistakes when you kill weeds in lawn
- Spraying a non-selective product over the whole lawn, which kills turf and leaves bare soil for new weeds.
- Using a product that is not labelled for your grass type, which can scorch buffalo or other soft-leaf turf.
- Spraying on a windy day or just before rain, so the product drifts onto beds or washes into drains.
- Mixing products or adding extra strength, which is off-label and can harm both the lawn and the environment.
- Mowing too short, which thins the turf and lets sunlight reach weed seeds.
- Skipping follow-up, so weeds seed again and the lawn never thickens.
When to call a gardener for weeds in your lawn
- The lawn is mostly weeds, and a renovation or new turf will do more than repeated spraying.
- You are paying someone to spray, in which case they need an EPA ground applicator licence unless it is routine garden maintenance.
- The weeds are near a creek, drain or pool, where runoff matters and licensed handling is safer.
- Large patches of weeds sit under trees, and the tree work may need an arborist and council approval before anyone cuts anything.
- You suspect insects or grubs are damaging the turf, in which case book a licensed pest controller instead of guessing.
- You are short on time or cannot carry sprayers and bags, and a regular gardener could handle the mowing and weeding together.
Cost to kill weeds in lawn in Sydney
| Job | Low | Typical | High |
|---|---|---|---|
| Weed removal (per hour) | $57 | $75 | $105 |
| Sydney gardener (per hour) | $52 | $75 | $115 |
| Edging and trimming add-on | $20 | $25 | $50 |
| Garden clean-up (half day) | $170 | $290 | $460 |
All prices include GST and reflect October 2026 Sydney rates.
FAQ: how to kill weeds in lawn questions
How to kill weeds in lawn without killing the grass?
Use a selective herbicide labelled for your turf variety, or pull weeds by hand when the soil is moist. Apply it on a calm day exactly as the label directs. Avoid non-selective sprays on lawn, because they kill the grass as well as the weeds.
How to kill weeds fast?
Hand pulling after rain removes weeds immediately, and a selective product works within a couple of weeks on actively growing plants (indicative — check the product label). Fast fixes that burn leaves, such as salt or bleach, damage soil and are not recommended.
How to get rid of weeds in lawn permanently?
No method is truly permanent, because seeds blow in. A dense, well-fed lawn mowed at the right height crowds out most weeds. Combine good mowing, regular feeding, aeration on compacted soil and quick removal of new weeds before they seed.
Do you need a licence to spray weeds in NSW?
If you spray weeds for fee or reward in NSW, you generally need an EPA ground applicator licence. Routine garden and lawn maintenance falls under an amenity horticulture exemption. If you are spraying your own lawn, follow the product label and keep runoff out of drains.
Getting weeds under control in Sydney
If your lawn is beyond a weekend fix, we can pull, treat and mow it back to health on a regular schedule. See our lawn mowing and edging service in Sydney, or read the common lawn weeds guide to identify what you are dealing with first.
