Perth’s Mediterranean climate — with its hot, dry summers and mild, wet winters — creates a unique set of challenges and opportunities for lawn care. Get the seasonal rhythm right and your lawn will thrive. Miss the key windows and you’ll spend summer fighting a losing battle against heat stress and bare patches.
Here’s what your Perth lawn needs through the year.
Autumn (March – May): Prepare for the Transition
Autumn is arguably the most important time of year for your lawn’s long-term health. As temperatures moderate and rains begin to return, the lawn is still actively growing and can recover quickly from summer stress.
Key tasks:
- Aerate and scarify if your lawn is compacted or has a thatch build-up. Autumn’s mild conditions allow fast recovery.
- Fertilise with a balanced fertiliser as growth resumes post-summer. Avoid high-nitrogen products late in autumn.
- Address bare patches now while growing conditions are ideal. Autumn is the best time to oversow or re-turf damaged areas.
- Adjust your retic schedule down as temperatures drop — overwatering in autumn causes more damage than underwatering.
Winter (June – August): Minimal Intervention
Perth winters are mild enough that warm-season grasses (kikuyu, couch, buffalo) don’t fully go dormant — but they do slow down significantly. This is a maintenance period, not a growth period.
Key tasks:
- Reduce mowing frequency — fortnightly is usually sufficient for most lawns in winter.
- Raise the cutting height by 5–10mm to protect roots and retain moisture.
- Turn off or heavily reduce reticulation — Perth’s winter rains should do most of the work. Running retic in winter wastes water and can cause disease.
- Watch for fungal diseases — cool, moist conditions in winter create ideal conditions for dollar spot and brown patch. Look for circular discoloured patches and treat early.
Spring (September – November): Peak Growing Season
Spring is when Perth lawns really want to run. Warm-season grasses bounce back aggressively from winter dormancy — kikuyu in particular can grow at extraordinary speed in October and November.
Key tasks:
- Increase mowing frequency — weekly or even more frequently for vigorous growers during peak spring growth.
- Fertilise again in late September or October with a nitrogen-rich fertiliser to fuel the growing surge.
- Check your reticulation before the weather gets hot. Spring is the last comfortable window to inspect, repair, and adjust your system.
- Scalp warm-season grasses early in spring (mid-September) to remove dead material and let sunlight reach the soil, encouraging faster green-up.
Summer (December – February): Defence Mode
Perth summers are brutal on lawns — 40°C days, low humidity, and long dry spells are the norm. Summer lawn care is primarily about defence: keeping the lawn watered correctly, mowing correctly, and not stressing the grass further.
Key tasks:
- Water deeply but infrequently — two to three times per week during the hottest months, watering early morning before 10am. Deep watering encourages deep root systems; frequent shallow watering keeps roots near the surface where they’re vulnerable.
- Raise your mowing height by 10–15mm compared to spring. Longer grass blades shade the soil, reduce moisture loss, and tolerate heat better.
- Reduce fertilising in peak summer — nitrogen pushes growth that the grass can’t sustain in heat.
- Don’t panic about dry spots — if you have efficient irrigation, targeted hand watering of hot spots is often more effective than flooding the whole lawn.
If you’d like professional help managing your lawn through the seasons, West Coast Greenscapes provides regular lawn mowing and maintenance schedules across all Perth Metro suburbs. Get in touch or request a free quote.