How Often Should You Really Mow? A Seasonal Guide for Melbourne

There’s a bloke two doors down from one of our regular clients in Hawthorn whose lawn looks immaculate every single day of the year. Same height, same density, same deep green. Meanwhile, his neighbour mows every Saturday like clockwork, spring through winter, cutting the same amount each time, and wonders why his lawn looks worse.

The difference isn’t talent or expensive products. It’s that one of them adjusts his mowing to the seasons, and the other doesn’t.

The one-third rule

Before we get into seasonal schedules, there’s one principle that matters more than any timetable: never cut more than one-third of the blade height in a single mow. Cut more than that and you stress the plant, expose the crown to sunburn, and invite weeds into the weakened turf.

This means if your target height is 40mm, you should mow before the grass reaches 60mm. Simple, but it’s the rule most people break.

Seasonal mowing for Melbourne

Melbourne’s climate means your lawn grows at dramatically different rates through the year. A fixed weekly schedule ignores that reality completely.

Spring (September to November)

Growth accelerates as temperatures climb through the teens and twenties. This is when your mower earns its keep.

• Frequency: Weekly, sometimes twice a week in late October and November
• Height: 30 to 40mm for most warm-season grasses
• Key move: Gradually lower your mowing height from winter levels. Drop 5mm per mow rather than scalping it in one go.

Summer (December to February)

Peak growth for warm-season grasses. Hot days mean the grass is working hard.

• Frequency: Every 5 to 7 days
• Height: Raise to 40 to 50mm. Taller grass shades the soil, reducing moisture loss and keeping roots cooler.
• Key move: Mow in the morning or late afternoon, never in the midday heat. A freshly cut lawn in 38-degree sun will brown off fast.

Autumn (March to May)

Growth slows as temperatures drop. This is recovery and preparation time.

• Frequency: Every 10 to 14 days
• Height: 35 to 45mm
• Key move: Let the lawn build up slightly before winter. Taller grass heading into the cold months protects the crown and roots.

Winter (June to August)

Warm-season grasses are dormant or barely ticking over. Cool-season grasses still grow slowly.

• Frequency: Monthly at most. Many Melbourne lawns don’t need mowing at all in June and July.
• Height: 45 to 55mm. Leave it tall.
• Key move: If you do mow, pick a dry day. Wet winter mowing compacts soil and tears grass rather than cutting cleanly.

Growth regulators: the secret weapon

Here’s something most homeowners don’t know about. Professional turf managers have been using plant growth regulators (PGRs) for decades on sports fields and golf courses. They’re starting to become available for residential use too.

What they do: PGRs like Primo Maxx (trinexapac-ethyl) suppress vertical growth by blocking the plant’s production of gibberellic acid. The grass still grows but puts its energy into lateral spread and root development instead of shooting upward.

The practical effect:

• Mowing frequency drops by 30 to 50%
• The lawn develops a denser, tighter canopy
• Root mass increases, improving drought tolerance
• Colour often deepens because the plant concentrates chlorophyll in shorter leaves

When to use them: Apply during the active growing season (October to March for warm-season grasses in Melbourne). They typically last 3 to 4 weeks per application.

The catch: PGRs aren’t cheap, and they need precise application rates. Over-apply and you can temporarily stunt or discolour the lawn. They’re best suited for people who genuinely enjoy fine-tuning their lawn, or for property managers who want to reduce mowing costs across large areas.

Our honest take: For the average Melbourne homeowner, PGRs are nice-to-have, not essential. Getting your mowing height and frequency right by season will get you 80% of the way there. But if you’re the type who wants that extra 20% of perfection, they’re worth exploring.

Common mowing mistakes

Mowing on a fixed schedule. Your lawn doesn’t know it’s Saturday. Mow based on growth, not the calendar.

Cutting too short. Scalping weakens the plant, exposes soil to sunlight (hello weeds), and reduces root depth. It’s the single most common mowing mistake we see.

Mowing with dull blades. Dull blades tear grass rather than cutting it cleanly, leaving ragged brown tips. Sharpen or replace blades at least twice a year.

Catching clippings every time. Mulch mowing returns nutrients to the soil. Unless you’ve let it get excessively long, leave the clippings where they fall.

Put it together

The bloke in Hawthorn with the perfect lawn isn’t doing anything magical. He mows frequently in spring and summer, backs off in autumn and winter, adjusts his height seasonally, keeps his blades sharp, and mulch mows. That’s it.

Match your mowing to how your grass is actually growing, not to a calendar on the fridge, and you’ll see the difference within a few weeks. It’s one of the simplest changes you can make, and one of the most visible.