Lawn Care by Season: An Australian Guide

A healthy, green lawn in Adelaide requires different care at different times of year. The city's Mediterranean climate, with hot dry summers and cool wet winters, means that the lawn mowing and maintenance strategies that work in Sydney or Melbourne need significant adjustment for South Australian conditions. This seasonal guide covers everything you need to keep your Adelaide lawn looking its best year-round.

Spring Lawn Care (September to November)

Spring is the most important season for Adelaide lawns. The transition from cool winter dormancy to active growth sets the tone for the rest of the year.

Mowing

As temperatures rise and growth accelerates, increase mowing frequency from fortnightly (winter) to weekly or even twice weekly by late spring. Start at a higher cut (50 to 60mm) in early spring and gradually lower to your summer mowing height (40 to 50mm for most varieties).

Fertilising

Apply a complete lawn fertiliser in September once soil temperatures reach 15 degrees. A slow-release granular fertiliser provides nutrients over 8 to 12 weeks. Look for formulations with nitrogen, phosphorus, potassium, and trace elements including iron for deep green colour.

Weed Control

Spring is critical for weed control. Apply a pre-emergent herbicide in early September to prevent summer weeds like crabgrass, summer grass, and oxalis from germinating. Spot-treat any existing broadleaf weeds with a selective herbicide.

Other Spring Tasks

• Aerate compacted areas with a core aerator (particularly important on Adelaide's clay soils)
• Overseed any bare patches with matching turf seed
• Check and service your irrigation system before summer demand begins
• Apply a light top-dressing of sandy loam to level minor undulations

Summer Lawn Care (December to February)

Summer is survival mode for Adelaide lawns. With temperatures regularly exceeding 35 degrees and heatwaves pushing past 40, your focus shifts to keeping the lawn alive and healthy.

Mowing

Raise your mowing height by 10 to 15mm in summer. Taller grass shades the soil, reduces evaporation, and keeps roots cooler. Never remove more than one-third of the leaf blade in a single mow. Mow in the early morning or late afternoon, never in the heat of the day.

Watering

Water deeply and infrequently rather than frequent light sprinklings. Deep watering (25 to 30mm per session) encourages roots to grow deeper, making the lawn more drought resilient. In Adelaide, most lawns need two to three deep waterings per week during summer. Water in the early morning (4am to 8am) to minimise evaporation.

Fertilising

Avoid heavy fertilising in the heat of summer as it can burn the lawn. A light application of liquid fertiliser in January provides a gentle boost without overwhelming stressed grass.

Autumn Lawn Care (March to May)

Autumn is recovery time and the second-best opportunity (after spring) to improve your lawn.

• Continue regular mowing as long as the lawn is actively growing
• Apply a balanced autumn fertiliser in March to build root strength before winter
• Aerate if the soil is compacted from summer foot traffic
• Overseed thin areas with matching seed while the soil is still warm
• Apply a pre-emergent herbicide in late April to prevent winter weeds
• Reduce watering as Adelaide's autumn rains begin

Winter Lawn Care (June to August)

Most Adelaide lawns slow dramatically or go dormant in winter, particularly warm-season varieties like Couch and Kikuyu.

• Reduce mowing to fortnightly or as needed. Buffalo stays greener and may need occasional mowing
• Raise mowing height to maximum for winter
• Avoid fertilising dormant lawns as the nutrients will not be used and may leach away
• Turn off irrigation and rely on natural rainfall
• Avoid heavy foot traffic on dormant or wet lawns to prevent compaction
• Remove fallen leaves promptly to prevent smothering

For weed-specific advice, see the weed control guide. To budget for professional lawn care, the garden maintenance cost guide covers all common services and pricing.

Common Lawn Problems in Adelaide and Solutions

Adelaide's specific climate conditions create several common lawn problems that are worth understanding and addressing proactively:

Dry patches and hydrophobic soil are extremely common in Adelaide's dry summers. Clay soils become water-repellent after prolonged dry periods, causing water to run off the surface rather than penetrating to the roots. Apply a granular wetting agent in early spring and again in autumn to break down the waxy coating that causes hydrophobicity. Aeration before applying the wetting agent improves penetration significantly.

Lawn grubs, including African black beetle larvae and army worms, cause brown patches by eating grass roots and crowns. Peak activity in Adelaide is February to April and September to November. If you notice birds (particularly starlings and magpies) pecking intensively at your lawn, it is likely they are feeding on grubs beneath the surface. Treat with a lawn grub control product applied in the late afternoon and watered in thoroughly.

Compacted clay soil is a chronic issue in Adelaide, particularly on new housing estates where builder traffic has compressed the soil. Compaction prevents water, air, and nutrients from reaching grass roots, resulting in thin, struggling lawns. Core aeration (removing small plugs of soil) once or twice yearly, ideally in spring and autumn, dramatically improves root growth and overall lawn health. Follow aeration with a top-dressing of sandy loam and a complete fertiliser for the best results.

Lawn Renovation vs Replacement

Sometimes a struggling lawn can be renovated back to health, while other times replacement is more cost-effective. Consider renovation if the lawn is more than 50 per cent alive with healthy grass, the variety is one you want to keep, the soil beneath is in reasonable condition, and the problems are primarily cosmetic such as thin patches or weed invasion.

Consider replacement if less than 50 per cent of the area has healthy grass, the variety is wrong for the conditions (such as shade-sensitive couch in a shaded area), the soil is severely compacted or contaminated, or you want to change to a different turf variety. Professional lawn renovation in Adelaide costs $5 to $15 per square metre and includes dethatching, aeration, top-dressing, overseeding, and fertilising. Complete replacement with new turf costs $20 to $45 per square metre but gives an instant result with a guaranteed fresh start.

Choosing the Right Mowing Height for Adelaide

Mowing height has a profound effect on lawn health, and getting it right for Adelaide's conditions makes a significant difference to how your lawn performs through the seasons. Each turf variety has an optimal height range:

Buffalo varieties (Sir Walter, Palmetto) should be maintained at 35 to 50mm in the growing season, rising to 50 to 60mm in winter. Buffalo's broad leaf blade shades the soil effectively even at lower heights, but raising the cut in summer reduces heat stress and water requirements.

Kikuyu performs best at 30 to 40mm during active growth, rising to 50mm in winter. Kikuyu's aggressive growth habit means it needs mowing more frequently than other varieties, sometimes twice weekly in peak spring and summer.

Couch varieties should be maintained at 15 to 25mm for the finest appearance, though many Adelaide homeowners keep them at 25 to 35mm for easier maintenance. Couch lawns mown at lower heights develop a denser, carpet-like surface but require more frequent mowing and a quality cylinder mower rather than a standard rotary.

Regardless of variety, never remove more than one-third of the leaf blade in a single mowing. This golden rule prevents stress, promotes healthy root growth, and maintains the lawn's ability to shade the soil and resist weed invasion. If the lawn has been neglected and grown tall, lower the height gradually over two to three mowings rather than scalping it back to the desired level in one pass.

Get Matched with Lawn Care Professionals in Adelaide

Professional lawn care takes the guesswork out of seasonal maintenance. From regular mowing and edging to fertilising programmes and weed management, qualified lawn care specialists keep your Adelaide lawn healthy year-round. Connect with qualified lawn care professionals in Adelaide for regular maintenance quotes tailored to your lawn.