Weed and feed is a lawn product that combines a selective herbicide with fertiliser, so you kill broadleaf weeds and green up the grass in one pass. It works best on a growing lawn with young weeds, and the biggest mistake is ignoring the label on timing, watering and your grass type.
This guide explains what it does, how to use it safely, how long to wait before mowing or watering, and when a pro is cheaper. It builds on our common lawn weeds guide.
Key points
- Use a registered product exactly as the label directs, including the listed grass types, weather conditions and waiting times for mowing and watering.
- Apply it when the lawn is actively growing and the weeds are young, not when the grass is dormant, drought-stressed or newly laid.
- Keep children and pets off the lawn until the label says it is safe, and keep runoff out of drains.
- A Sydney gardener charges about $75 per hour (range $52 to $115) and weed removal about $75 per hour (range $57 to $105), including GST, as at October 2026.
What does weed and feed do and how does it work?
It treats two problems at once, which is handy on a lawn that is both thin and weedy.
| Part | What it does | What to remember |
|---|---|---|
| Selective herbicide | Targets listed broadleaf weeds through the leaves, leaving the labelled grass types alone | Only the weeds named on the label are controlled, so check yours is listed. |
| Fertiliser | Feeds the lawn so thicker grass crowds out new weeds | It won’t fix compaction, shade or poor drainage on its own. |
| Granular form | Spread by hand or spreader and watered in | Even spreading matters, as stripes appear where rates overlap. |
| Liquid or spray form | Mixed or ready-to-use and sprayed on the foliage | Spray only in calm weather, never before rain, and follow the label for mixing. |
| Sensitive lawns | Some grasses are damaged by certain actives | Check that your lawn variety appears on the label before you buy. |
Does weed and feed work on your lawn?
It works well in the right conditions, and it fails when people expect it to fix everything.
- It works on young broadleaf weeds such as clover and dandelion when the lawn is actively growing and the product is applied as directed.
- It usually struggles on mature weeds, deep-rooted perennials and grassy weeds such as winter grass, which often need a specific product.
- Expect a second treatment for stubborn weeds, but only if the label allows another application and gives the interval.
- A lawn that is thin because of shade, compaction or constant scalping needs those problems fixed as well as feeding.
- Buffalo lawns thinning under jacarandas in the Inner West often respond better to improved light and aeration than to extra product.
- Hand-pulling small patches is a reasonable alternative when you only have a few weeds in an otherwise healthy lawn.
When to weed and feed your lawn
Timing depends on your grass and the weeds you want to control, so the label is your final guide.
| Season | What to do | Why |
|---|---|---|
| Spring (Sep to Nov) | Treat warm-season lawns such as buffalo, kikuyu and couch once they are growing steadily | Grass uptake is strongest and weeds are young. |
| Summer (Dec to Feb) | Avoid hot, dry spells and heatwaves | Stressed lawns can burn, and water restrictions limit watering in. |
| Autumn (Mar to May) | Treat before the lawn slows for winter if the label allows | Weeds are still active, and the lawn can recover before cold weather. |
| Winter (Jun to Aug) | Avoid feeding dormant warm-season lawns | Dormant grass can’t use fertiliser, and bindii control needs a specific product. |
How to use weed and feed spray or granules
Follow these steps and the product label together, because the label always overrides general advice.
- Read the label for your grass type, target weeds, weather limits, waiting times and protective equipment before you buy.
- Mow a few days beforehand if the label recommends it, and avoid treating a lawn that is wilting or very dry.
- Check the forecast: don’t spray in wind or before rain unless the label says it is safe to do so.
- Wear the protective clothing, gloves and eye protection listed on the label, and keep children and pets inside.
- Apply evenly using the method on the label, and never exceed or mix extra product, as more does not work faster.
- Keep product off paths, gardens and drains, and sweep stray granules back onto the lawn rather than hosing them away.
- Water in only if the label says to, and do it before 10 am or after 4 pm using a trigger nozzle, with no runoff onto hard surfaces.
Waiting times: mowing, watering and re-entry
Waiting times vary by product, so these are the questions to answer from your own label.
| Question | Typical guidance | What to do |
|---|---|---|
| How long before you can mow | Often a few days after treatment (indicative — check the product instructions) | Leave the clippings where the label allows, and don’t mow wet grass. |
| How long before you can water | Some products need watering in at once, others need dry weather | Follow the label and the Water Wise hours. |
| How long until pets and children can use the lawn | Set by the label | Keep them off until the label says it is safe. |
| How long until results show | Often a week or two for weeds (indicative — check the product instructions) | Be patient; weeds wilt and twist before they die. |
When you mow again, stay inside NSW noise hours: 7 am to 8 pm on weekdays and Saturdays, and 8 am to 8 pm on Sundays and public holidays.
Does it kill bindi and other lawn weeds?
Many products list bindii, but timing is critical because the plant is easiest to control while it is small.
- Bindii (also spelt bindi) is a low winter weed that produces spiny burrs in spring, so early treatment matters; see our bindii weed killer guide.
- Check that bindii is named on the label, as not every product lists it.
- Clover and dandelion respond well to labelled broadleaf products when the lawn is growing.
- Onion weed and pennywort are tough, so see our guide to killing weeds naturally for the trade-offs of non-chemical methods.
- Vinegar, salt and boiling water are non-selective and can damage soil and nearby plants, so they are not safer by default.
- Lawn grubs and other insects belong to a licensed pest controller, not a weed product.
Weed and feed vs hand weeding and spot treatment
Choose the method by the size of the problem and the condition of the lawn.
| Method | Best for | Watch out for |
|---|---|---|
| Combined product | A thin lawn with many young broadleaf weeds | Grass type, weather and label limits. |
| Spot spray | A few isolated weeds in a healthy lawn | Overspray onto garden beds. |
| Hand weeding | Small patches and weeds with shallow roots | Time and regrowth from missed roots. |
| Hiring a gardener | Large lawns or when you have no time | Ask whether the job needs a licence; paid spraying for fee or reward requires an EPA ground applicator licence, though routine garden and lawn maintenance has an exemption. |
Weed control cost in Sydney
These Sydney prices include GST and are current for October 2026.
| Job | Low | Typical | High |
|---|---|---|---|
| Weed removal, per hour | $57 | $75 | $105 |
| Gardener, per hour | $52 | $75 | $115 |
| Mowing, medium lawn 100 to 250 m² | $65 | $100 | $150 |
| Fortnightly maintenance, medium lawn | $60 | $75 | $120 |
| Edging and trimming add-on | $20 | $25 | $50 |
Common mistakes to avoid
- Applying the product to a dormant, drought-stressed or newly laid lawn, which can scorch the grass and waste fertiliser.
- Skipping the label and using a product that isn’t listed for your grass, especially on buffalo or couch varieties.
- Spraying in wind or before rain, so product drifts onto garden beds or washes into drains.
- Mixing products or adding extra to speed things up; never combine products or use them off-label.
- Letting pets or children back on the lawn too soon, instead of waiting until the label says it is safe.
- Watering outside Water Wise hours, or hosing granules off paths onto hard surfaces and into stormwater.
Frequently asked questions
Is weed and feed safe for dogs?
Keep dogs off the lawn until the label says it is safe, and store product where pets can’t reach it. Owners report drooling, vomiting or lethargy after exposure. If your dog has eaten product or grass you treated, contact your vet or the Animal Poisons Helpline straight away.
How long does weed and feed take to work?
Weeds usually start to twist and wilt within days, with full results often taking a week or two (indicative — check the product instructions). The lawn greens up as the fertiliser takes effect. Cool weather and dry soil slow the result, so avoid judging it too early.
Does weed and feed work on all weeds?
No. It targets the weeds named on the label, mostly young broadleaf weeds in an actively growing lawn. Grassy weeds like winter grass, mature perennials and some tough weeds may need a different product or repeated treatment. Always check that your weed and your grass are both listed.
Does weed and feed kill bindi?
Some products list bindii, but you should confirm this on the label. Treatment works best on young plants before they form spiny burrs in spring. If bindii is already spiky, mowing and picking up burrs will help while you plan earlier treatment next season.
Getting your lawn treated in Sydney
If you’d rather leave the label-reading to someone else, we can mow, edge and tidy your lawn and recommend the right timing for weed control. Identify your weeds first, then book lawn mowing in Sydney and ask for a written quote.
