Autumn is the second most important lawn care window in Melbourne — and the most underused one. Most Melbourne homeowners think about their lawn in spring and summer, and then forget about it in March and April when the good autumn weather makes it easy to do the preparation work that determines how the lawn performs next season. This guide covers the autumn lawn care tasks that make a real difference, when to do them, and which ones can wait. For the full seasonal picture, see our spring garden maintenance guide and summer lawn care guide.
Why autumn lawn care matters in Melbourne
Melbourne's warm-season grasses slow their growth significantly from April onwards as soil temperatures drop. The lawn enters a lower-energy phase and eventually semi-dormancy through the coldest winter months. The work done in autumn — repairing damage from summer, managing weed pressure before winter, and supporting the root system before dormancy — determines what the lawn looks like when it wakes up in spring.
A lawn that goes into winter with good root depth, controlled weed pressure, and no significant unrepaired damage comes out of winter in far better condition than one that limps into the cooler months stressed and neglected.
March: repairing summer damage
Assess and repair bare patches from summer
March and April are an excellent window for lawn patch repairs. Soil temperatures are still warm enough for grass to establish, growth is still active, and the extreme heat stress of summer has passed. See our guide on fixing dead and bare patches in Melbourne lawns for the step-by-step repair process.
Final summer aeration if not done in spring
If the lawn was not aerated in spring and compaction is an issue — shown by water pooling after rain or thin grass in high-traffic areas — March is the second window for core aeration before the lawn enters its low-growth period. See our lawn aeration and top-dressing guide for how to approach it.
Autumn lawn care handled for you.
Professional lawn mowing on a fortnightly or monthly schedule through the cooler months.
April: weed management and preparation for winter
Pre-emergent herbicide for winter grass
Winter grass (Poa annua) germinates as soil temperatures drop in autumn and grows vigorously through Melbourne winter when the warm-season lawn is dormant. The pre-emergent herbicide window — applied before the seed germinates — closes in April or early May. If winter grass has been a persistent problem, a pre-emergent application in April is the most effective management tool available.
Autumn fertiliser application
A potassium-rich fertiliser applied in early April supports plant hardiness and root development going into winter. Potassium improves cold tolerance and disease resistance. Avoid high-nitrogen fertilisers in late autumn — they stimulate lush soft growth that is frost-susceptible.
Raising the mowing height
As growth slows through April and May, gradually raise the mowing height slightly. Longer grass going into winter retains more energy reserves and provides better insulation to the crown. Reduce mowing frequency to monthly or less as growth slows.
Dealing with fallen leaves on Melbourne lawns
Autumn brings leaf fall in Melbourne's deciduous gardens. A light covering of leaves over the lawn can be mulch-mowed back into the lawn as organic matter. A heavy covering of leaves that blocks light and traps moisture needs to be removed — either by blowing, raking, or a mowing pass that shreds and removes the material. Leaves left to mat on the lawn through autumn create ideal conditions for fungal disease and can kill the grass beneath them.
FAQ: Autumn lawn care in Melbourne
Should I fertilise my Melbourne lawn in autumn?
Yes — but with a different product than spring. A potassium-rich fertiliser in April supports root development and cold hardiness. Avoid high-nitrogen products in April and May as they push lush growth that can be frost-damaged. Fertilising in June onwards is too late to be effective before the lawn goes dormant.
Can I repair lawn patches in autumn?
Yes. March and April are a good window for patch repairs — soil temperatures are still adequate for establishment and the extreme heat of summer has passed. May is borderline depending on conditions. June onwards is too late for warm-season grass seed to establish before winter dormancy — repairs in late autumn are better done with turf pieces than seed.
How often should I mow in Melbourne autumn?
April: fortnightly. May: monthly or less. By June the lawn may need mowing only occasionally or not at all depending on conditions and grass type.
Do I need to water the lawn in Melbourne autumn?
Progressively less so. Melbourne typically receives meaningful autumn rainfall from March onwards, and supplementary watering requirements reduce significantly. Scale back irrigation frequency in March and April, and turn off the irrigation system in May unless there is an extended dry spell. Running irrigation through Melbourne's wet winter months is generally wasteful and contributes to waterlogging and fungal problems.
