Why Does My Lawn Have Brown Spots? A Perth Lawn Troubleshooting Guide
Brown spots on lawn areas can be frustrating, especially when the rest of your grass looks healthy. In Perth, a patch may be linked to uneven watering, heat, soil conditions, mowing, heavy traffic, or another underlying problem, so simply watering more is not always the answer.
The key is to look at where the brown spot appears, how it feels, and how it is changing. A dry, brittle patch calls for a different response from grass that is brown but sitting in wet soil.
Let’s understand the common causes of lawn brown spots and the signs that can help you narrow down the problem. You will also learn how to correct the issue, when a damaged patch can recover, and when replacing the turf may be the better option.
What Causes Brown Spots on a Lawn?
The causes of brown spots on lawn areas are not always obvious. Common causes include:
- Water stress: Dry soil, uneven irrigation, or water-repellent soil can leave sections short of moisture.
- Heat and seasonal stress: Hot, dry conditions can cause grass to curl, dry out, and turn brown.
- Poor soil conditions: Perth’s sandy soils can allow water to move through quickly or become difficult to wet evenly.
- Wear and traffic: Heavy use can thin turf and slow its recovery.
- Mowing problems: Cutting too low can add stress and contribute to brown areas.
- Nutrient problems: Poor nutrition can affect colour and growth, while excessive fertiliser can damage turf.
- Pests or disease: These are possible, but brown colour alone is not enough to identify the cause.
Yellow or brown patches can be linked to water stress, nutrient availability and seasonal weather, while dry patches can occur when WA soils become water-repellent.
How Can You Tell What Is Causing the Brown Spots?
Start with the affected area rather than treating the whole lawn. Check the soil beneath the grass, look at how the patch is spreading, and review your irrigation.
| What you notice | What to check first |
| Dry, brittle grass | Soil moisture and irrigation coverage. |
| Small, dark or irregular spots | Wear, mowing, pests or other localised stress. |
| Circular or spreading patches | Moisture, disease or pest activity. |
| Brown grass in wet areas | Drainage, over watering or poor soil conditions. |
| Brown edges on new turf | Moisture, wind exposure and soil contact. |
1. Do the Brown Spots Feel Dry and Brittle?
If the grass feels dry and the soil beneath it is also dry, start by checking irrigation. Water Corporation advises checking sprinkler performance and using catch cups to identify uneven watering.
Perth’s sandy soils can also become water-repellent, so simply watering for longer may not solve the problem. A wetting agent and improved soil moisture management may be needed.
2. Are the Brown Spots Small, Dark or Irregular?
Small areas can result from wear, mowing stress, pests or other localised factors. Check for thinning, damaged leaves, insect activity or recent changes in lawn care.
Do not assume every small brown patch is disease. If it is spreading or the cause is unclear, have it assessed before treatment.
3. Are the Brown Patches Circular or Spreading?
Circular or expanding patches can result from disease, pests, moisture problems, or localised soil conditions. Shape alone cannot confirm the cause.
Check soil moisture, irrigation coverage and whether the turf variety suits the conditions.
4. Are the Brown Areas in Wet or Waterlogged Spots?
Brown grass does not always mean a lawn needs more water. Persistently wet or soft areas can point to over watering, drainage problems, or uneven ground.
Reduce unnecessary watering and check whether water is pooling after irrigation. The goal is to get moisture into the root zone without leaving the turf constantly saturated.
Could Watering Be Causing Brown Spots on Your Lawn?
Yes. Uneven irrigation is one of the first things to investigate when lawn brown spots appear. Blocked or misaligned sprinklers, unsuitable sprinkler heads, and inconsistent coverage can leave some sections much drier than others.
Run your irrigation system and check each area. Catch cups can show whether water is being distributed evenly. Water early in the morning where practical, and adjust watering according to the season, rainfall, soil and turf variety rather than automatically watering more often.
Can Pets Cause Brown Spots in Grass?
Concentrated pet urine can damage grass and cause localised brown patches. If patches repeatedly appear where a pet urinates, rinse the area with water and encourage pets to use another spot.
Can Lawn Pests or Disease Cause Brown Patches?
Yes, but do not diagnose them from colour or shape alone. Turf pests and diseases can produce dry, thinning, circular, irregular or spreading damage.
Look for chewed leaves, unusual growth, water-soaked tissue or visible insects. If damage spreads quickly, have it assessed before treatment.
Could Fertiliser Be Causing Brown Spots?
It can. Too much fertiliser or incorrect application can stress turf, while poor nutrition can weaken growth and colour.
Follow product instructions and identify the underlying cause before adding more fertiliser. Try maintenance based on turf variety and seasonal conditions.
How Do You Fix Brown Spots on Your Lawn?
Once you identify the likely cause, treat that issue rather than every brown area in the same way.
- Check moisture. Apply catch cups to area and run irrigation. Feel beneath the turf and confirm that irrigation is reaching the affected area.
- Check irrigation. Look for blocked or misaligned sprinklers and again use catch cups to test for even coverage.
- Improve soil moisture. If Perth’s sandy soil is repelling water, consider an appropriate wetting agent.
- Reduce stress. Limit heavy traffic and avoid mowing too low while the lawn is recovering.
- Correct nutrition carefully. Use a suitable fertiliser at the recommended rate and timing.
- Monitor the patch. If it continues to spread despite correcting the obvious cause, seek advice rather than repeatedly applying products.
A brown lawn can sometimes recover when the grass is still alive. Water Corporation recommends checking the plant crown and addressing soil, irrigation, and other underlying conditions rather than relying on water alone.
When Should You Replace a Brown Patch Instead of Repairing It?
Small damaged sections may recover once the cause is corrected. Replacement is more practical when areas have failed, problems keep returning, or the turf variety does not suit the site’s conditions.
Before replacing turf, identify why it failed so the same problem does not affect the new lawn.
Can Turf Variety Affect Brown Spot Problems?
Yes. Turf varieties differ in shade tolerance, wear tolerance, drought tolerance, and maintenance needs, so the same site conditions can affect varieties differently.
Buffalo turf such as Sir Walter can be a suitable option where shade tolerance, durability, and lower maintenance are important. Sir Walter is a low-water-use Buffalo with good shade, drought and wear tolerance, with a minimum direct-sunlight requirement of four hours per day.
Match the turf to the property’s sunlight, traffic, water and maintenance conditions to reduce avoidable stress.
What If the Brown Spots Are on Newly Laid Turf?
New turf can show temporary yellowing or slight browning during the first week or two while it establishes. That does not automatically mean failure.
Check the soil beneath the turf, look for gaps or poor contact, and keep the rolls consistently moist. Brown edges can dry faster from wind and heat, while easily lifted turf may indicate poor rooting.
For more detail, see our guide to problems with newly laid turf
Closing Thought
Brown spots do not always mean your lawn needs more water. Before treating the affected area, check the soil moisture, irrigation coverage, mowing, traffic and recent lawn treatments. If the problem continues or spreads, the turf variety, pests or disease may need closer attention.
For homeowners replacing damaged turf or starting again, choosing a variety suited to Perth’s conditions can make ongoing lawn care easier. Greenacres Turf Group has been growing and supplying turf in Western Australia since 1990, with varieties selected for different levels of sunlight, wear, water use and maintenance needs.
If you are unsure which turf is right for your property, Greenacres can help you compare the available varieties and choose an option suited to your lawn’s conditions.
FAQs
Can brown grass turn green again?
Yes, if the grass is still alive and the underlying problem is corrected. Moisture- or heat-stressed turf may recover as conditions improve.
Why are my brown lawn spots getting bigger?
Expanding patches can indicate moisture stress, uneven irrigation, pests, disease, or another unresolved problem. Check soil and irrigation first.
Should I water brown patches every day?
Not automatically. Check soil and irrigation first. More water will not fix water-repellent soil, poor drainage, or uneven sprinkler coverage.
How do I know if brown spots are caused by lawn disease?
Brown colour or patch shape alone cannot confirm disease. Look for additional symptoms and seek assessment if the area spreads or the cause is unclear.
When should I replace a brown patch of grass?
Consider replacement when the affected section has failed extensively, keeps recurring despite corrective care, or the turf variety is unsuitable for the site.
