Seasonal Lawn Calendar · Perth, WA
Lawn
Maintenance
Your month-by-month guide to keeping your Perth lawn looking perfect all year round. Timing is everything — follow this guide and your lawn will reward you through every season.
⏰
Timing is the most important thing in lawn care. Save this guide and come back each month.
Season One
☀️ Summer
December · January · February
December
Water
Monitor closely and water regularly. Don't rely on retic alone in very dry conditions — soil may need a manual top-up to hold enough moisture.
Feeding + Wetting Agent
Fertilise again and apply a commercial-grade wetting agent. Commercial agents generally outperform retail options and contain added trace elements.
⚡ Lawn Tip
One long, slow watering is better than multiple short waterings.
January
Water
Keep watering regularly — especially during heat waves. Watch for dry or yellow patches that might signal hydrophobic soil.
Pests
Watch for black beetles, armyworm, bindii and black spot. Check our Pest Identifier at lawndoctor.com.au for diagnosis and treatment advice.
⚡ Lawn Tip
Always have a preventative pest treatment plan — don't wait for damage to appear.
February
Water + Liquid Wetting Agent
Keep lawn hydrated through remaining hot weather. Research shows wetting agents work best when applied in January and February — don't skip this one.
Autumn Pre-Emergent Prep
Late February is the ideal time to plan your autumn pre-emergent application. Get your products ready — the window opens in March.
⚡ Lawn Tip
Wetting agents applied in late summer give the best results heading into autumn.
Season Two
🍂 Autumn
March · April · May
March
Aerate
Aerate compacted areas to promote root growth and get your lawn into its best possible condition heading into the cooler months.
Pre-Emergent Herbicide
Apply a quality pre-emergent to stop seasonal weeds (like wintergrass) before they germinate. Act now — once you can see them, it's too late.
⚠️ Autumn Alert
Prevention is better than cure. The pre-emergent window closes in April.
April
Feeding — Most Important of the Year
The April fertilise is the most critical of the year. It builds root depth and energy reserves so your lawn holds its colour through winter and bounces back fast in spring.
Mowing Height
Don't cut shorter than normal heading into winter. Maintaining height promotes a denser, weed-resistant lawn and reduces fungal disease risk.
⚡ Lawn Tip
Lawns that stay visible through winter come out denser and healthier in spring.
May
Plant Growth Regulator
Humid conditions encourage both growth and disease. Apply another round of PGR to control growth and build lawn density.
Disease Check
Inspect for mottling or unusual discolouration. Apply a preventative fungicide if you see early signs — check our Disease Identifier at lawndoctor.com.au.
Weeding
Kill existing weeds on dry, calm days before they set seed. Use a selective herbicide appropriate for your turf variety.
Season Three
❄️ Winter
June · July · August
June
Water + Wetting Agent
Monitor lawn moisture and apply a liquid wetting agent. Don't assume winter rain is doing the job — Perth soils can still be hydrophobic even in wet weather.
Maintenance — Leaf Removal
Remove fallen leaves promptly — they block light and cause browning that is hard to recover from. Avoid excess fertiliser that pushes rank, weak growth.
⚡ Lawn Tip
Fertilise any dry patches you identified earlier in the season.
July
Leaf Removal
Keep removing fallen leaves. Mow at a higher setting and maintain consistent height to stay healthy through the coldest part of winter.
Liquid Wetting Agent
Apply a liquid fertiliser/wetting agent — even if roots aren't fully established, the leaf takes up nutrients and distributes them to the lawn. Helps prevent dry patch.
⚡ Lawn Tip
Unusual colour? Check our Disease Identifier at lawndoctor.com.au for a diagnosis.
August
Weeding — Spring Prep
Apply a selective herbicide now to get on top of bindii and spring grass before it emerges. Don't let weeds get a head start on your lawn.
Sharpen Mower Blades
Prepare for spring now. Sharp blades prevent thatch, promote healthy turf and reduce disease risk. Service your mower before the busy season starts.
🌿 Lawn Tip
An awesome spring lawn starts with August preparation.
Season Four
🌱 Spring
September · October · November
September
Feeding
Apply a long-term fertiliser as growth picks up — makes grass stronger, thicker and greener heading into the warm months.
Weeding
Apply a seasonal weed and feed to get on top of weeds before they take hold for the season.
Water & Wetting Agent
Add a granular wetting agent. Allow to dry before watering in thoroughly to ensure proper penetration.
Retic Audit
Check coverage with catch cups. Look for broken, blocked or misaligned sprinklers and damaged pipes before the hot season starts.
🌿 Lawn Tip
Spring is a great time to lay new turf!
October
Pre-Emergent Herbicide
Summer weeds are starting. Apply a pre-emergent herbicide now to stop them before they germinate. Timing is critical.
Remove Runners / Aerate
Stop couch runners invading garden edges. If lawn feels compacted and hard, consider aerating or scarifying.
Plant Growth Regulator
Apply a PGR to slow vertical growth, thicken the canopy, reduce weed opportunity and promote lateral growth for a denser, more resilient lawn.
🌿 Lawn Tip
Use a pre-emergent that also contains fertiliser for a double benefit!
November
Pests — Armyworm Watch
Watch for bare or dead patches — signs of armyworm. Apply a broad-spectrum systemic insecticide if confirmed. Use our Pest Identifier to diagnose.
Check for Seed Heads
Seeding can indicate heat stress from lack of water or nutrient. Address the cause early before it affects lawn quality.
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