August is the hinge month in an Australian garden. Growth is still slow and the soil is cold, but bud burst is only weeks away, which makes this the last quiet window to prune, feed, mulch and plant before spring pulls everything forward at once. The list below is ordered the way we work through it at the nursery, and split by climate.
Quick facts
| Climate zone | Typical August conditions | Priority jobs |
|---|---|---|
| Subtropical (Brisbane, Gold Coast, northern NSW) | Dry and mild, roughly 11 to 23°C, gusty westerly winds | Deep watering, mulching, main planting window opens |
| Warm temperate (Sydney, Perth) | 9 to 19°C; Perth still in its wettest months | Planting, rose and crepe myrtle pruning, first feed |
| Cool temperate (Melbourne, Adelaide, Hobart) | Cold and wet, roughly 6 to 16°C, soil saturated | Last of the bare-rooted planting, dormant pruning |
| Frost-prone inland (Canberra, Ballarat, Toowoomba, tablelands) | Frosts to around -5°C, still occurring | Dormant pruning only, hold tender planting |
| Tropical (Cairns, Townsville, Darwin) | Dry season, roughly 18 to 29°C, little rain | Irrigation checks, tidy-up pruning before the wet |
Choosing the right jobs for your climate
Most gardening advice online is written for the northern hemisphere, where August is high summer. Ignore it. In Australia this is late winter, and you are in one of three situations.
North of about Coffs Harbour, winter is your dry season rather than your cold one. Soil temperatures rarely drop below 14°C, roots keep working, and August is one of the best planting months of the year. Water is the limiting factor, not warmth.
In Sydney, Perth and coastal South Australia you are in the overlap. Frost is rare near the coast, so dormant pruning and new planting can happen in the same weekend. Perth gardeners have moist sand right now, which is exactly when new plants should go in, well before the summer dry.
Inland and south of the Divide, treat August as preparation. The ground is cold and often waterlogged, and anything frost-tender planted now will sulk. Use the month for pruning, soil improvement and the last of the bare-rooted stock. Our guide to the best time to plant a tree in Australia sets out the windows region by region.
How to plant in late winter
Bare-rooted deciduous trees, roses and fruit trees are sold from June until the end of August while they are dormant. Once buds swell the season is over, so this is the deadline. Soak the roots in a bucket of water for an hour before planting, spread them over a low cone of soil in the base of the hole, and set the graft union or old soil mark at finished ground level rather than burying it.
Potted plants can go in at any time, and August suits them because they get a full spring to root out before the first heatwave. Dig the hole twice as wide as the pot but no deeper, so the plant sits on undisturbed ground and cannot sink. Tease circling roots free, backfill with the soil you removed rather than a rich imported mix, and firm it gently.
Do the soil work now rather than later. Dig 50 to 100mm of compost through the top 200mm of any bed you plan to plant in spring. On sodic clay that sets hard and disperses in water, a natural gypsum clay breaker is the correct amendment. On water-repellent sands, a wetting agent matters far more than fertiliser. There is more in our guide to preparing soil for planting.
Ongoing care
Watering
Winter in the subtropics is dry, and August is when established evergreens quietly run short. Give trees and hedges one long soak every 10 to 14 days rather than frequent sprinkles, wetting the top 300mm of soil. Pots dry faster than beds even in cool weather, so check them weekly by weight. In Melbourne and Hobart the opposite applies: hold off unless a bed is under eaves, because cold saturated soil causes winter root rot.
Feeding
Feed when the soil warms, not when the calendar says so. A complete fertiliser applied to cold wet ground leaches straight past the root zone. In Brisbane and northern New South Wales, mid to late August is well timed; in the south, wait for early September. Citrus should be fed as soon as the last fruit comes off, and grevilleas, banksias and other Proteaceae need a low-phosphorus native formulation rather than a general fertiliser. Our explainer on how fertilisers actually work covers the difference between controlled-release and liquid feeding.
Pruning
Prune anything that flowers on new season growth while it is still dormant: roses, crepe myrtle, hydrangea, wisteria, grapevines and deciduous fruit trees. Keep the cuts clean and above an outward-facing bud. Crepe myrtles need only dead wood removed and a light tip prune, not the annual amputation you see on suburban verges. Leave spring-flowering shrubs alone until they finish, and prune camellias as soon as the last flower drops rather than before. If you are new to it, start with pruning for beginners.
Common problems and fixes
Scale and sooty mould on citrus and gardenias. Late winter is the ideal time to spray horticultural oil, because the plants are not heat stressed and pest numbers are at their lowest. Cover the leaf undersides and repeat in three weeks.
Peach leaf curl. Once leaves emerge distorted and red it is too late for that season. Copper spray applied at bud swell, before the buds open, is the only reliable control, which makes August the deadline in most districts.
Aphids on new growth. Roses and citrus tips attract them as soon as growth starts. Hose them off; ladybirds arrive within a fortnight and finish the job.
Yellow, tired lawns. Warm-season turf such as couch, buffalo and kikuyu barely grows until soil temperature passes about 18°C, so feeding or scalping now wastes product. Renovate in September instead.
Weeds getting away. Winter weeds set seed in early spring, so pulling them in August removes an entire generation before it happens.
Frequently asked questions
Is August too early to plant in Australia?
In the subtropics and along the warm coast, no: soil is warming, the air is mild and roots establish for weeks before top growth starts. In Melbourne, Adelaide, Canberra and the tablelands, potted plants are fine but hold frost-tender species such as murraya, frangipani and tropical foliage until October when the last frosts have passed.
What should I prune in August?
Anything that flowers on new season wood while it is still dormant: roses, crepe myrtle, hydrangea, wisteria, grapevines and deciduous fruit trees. Leave spring-flowering shrubs such as azalea, magnolia and camellia alone until they have finished blooming, because their buds were set last season and pruning now removes the display.
When is the last chance to plant bare-rooted trees?
Bare-rooted stock is sold from June to the end of August while the plants are dormant. Once buds swell the window closes, so late August is genuinely the deadline. If you miss it, potted deciduous trees can go in at any time of year provided you water them through their first summer.
Should I fertilise in August?
Wait for the soil to warm rather than the calendar. In Brisbane and northern New South Wales a complete fertiliser applied mid to late August is well timed. In Melbourne, Adelaide and Hobart, early September is closer to the mark, because nutrients applied to cold wet soil simply leach away before roots can use them.
Why does my garden look worst in August?
Late winter combines the lowest light of the year with cold soil, dry westerly winds and the tail of any frost damage. Evergreens often shed their oldest leaves now to fund the spring flush. Deep watering, a top-up of mulch and patience usually fix it within four to six weeks.
Ready to plant?
Finish the month by topping mulch back to 75mm across every bed, keeping it clear of trunks and stems, because that single job carries the garden through spring. A bale of sugar cane mulch covers a surprising area and breaks down into the soil rather than sitting on top of it. Everything you need for the jobs above sits in our potting mixes, mulches and fertilisers range, and if you are already thinking about what goes in the ground next month, our spring planting guide is the natural next read.
