September to November · Sydney
In this guide
Gardening in Sydney changes completely with the seasons. Through winter, growth slows to almost nothing and a garden can be left alone for a month without anyone noticing. Then the temperature lifts, the growing season kicks off, and everything happens at once. Spring starts here at the beginning of September, the gardens wake up, lawns start growing faster and things begin to flower. It is my favourite time of year in the garden, and the busiest.
It is also the time of year people get the order of things wrong. Fertiliser goes down before the soil is warm enough to use it. Mulch goes over weeds instead of after them. Hedges get cut in the middle of a flowering flush. None of it is hard — it just has a sequence, and this guide is that sequence, in the order a Sydney spring actually runs.
Almost every garden that sails through a Sydney summer was set up for it in September and October. The ones that struggle in February usually missed something in spring.
That is not an exaggeration. A bed that gets weeded, fed and mulched properly in October holds moisture through January and shrugs off a week of forty degrees. The identical bed left bare bakes, goes water-repellent, and needs three times the watering to look half as good. A lawn fed and repaired while the runners are moving thickens up enough to crowd out summer weeds; the same lawn left until December spends the whole season thin. Spring is when the cheap work happens. Everything after it is either maintenance or rescue.
What follows runs in the order you would actually do it: understand the timing, work out where to start, get the weeds out, sort the soil, then pruning, the lawn, planting, pests and watering. There is a plan tool part way down that will sequence the jobs for your particular garden.
Spring starts in September
This is the single most useful thing to understand about a Sydney spring. Air temperature jumps around week to week; soil temperature climbs slowly and steadily, and it is what plants and warm-season lawns actually respond to.
Now is the time to dust off the mower and the rest of the gear, because it is about to get a proper workout. The first job is the beds: get the weeds out while the soil is still soft from winter rain and while they are small enough to pull cleanly. Weeds take nutrients and water that were meant for your plants, and a weed pulled in September is a weed that never sets seed in October.
Then mulch. Sydney is well supplied with mulch thanks to the sheer number of trees around, and getting a fresh layer down early is the highest-value hour you will spend in the garden all year. It holds moisture in, keeps the soil temperature steady, and blocks the light that weed seed needs to germinate. Do it after weeding and after feeding, never before.
Weed → prune → feed → water it in → mulch. Mulching over a weedy bed just hides the problem for a fortnight. Mulching over dry soil is worse: a thick layer of dry mulch will shed a light rain rather than let it through, so soak the bed properly before you spread.
The other job worth starting in spring is a compost. The temperature in and around Sydney from September onwards is close to ideal for it, and the payoff is a steady supply of rich, dark, nutrient-dense material for your beds that costs nothing and keeps a serious amount of waste out of landfill. There is a cross-section of what actually goes in one further down this page.
Know what you are pulling
“Get the weeds out” is easy advice and useless on its own, because half of these need completely different handling and two of them get worse if you attack them the obvious way. These are the ones that turn up in almost every garden between August and November.
A flat, ferny rosette that sits below mower height all winter and is almost invisible until it sets the seed pods that spike bare feet in October.
The fix: treat it in June or July while it is still a soft rosette. By the time you can feel the prickles the seed has already set and nothing will help that season.
Too late by spring — diary it for winterBright, soft, light-green tufts that grow faster than the lawn around them and carry fluffy seed heads. It dies off in the first real heat and leaves bare patches behind.
The fix: get it out before those seed heads open, because one plant drops thousands of seeds that wait in the soil for next winter. Hand-pull small outbreaks; a thick, well-fed lawn is what stops it coming back.
Pull it now, before it seedsThree rounded leaflets with a pale crescent marking, low mats and small white flowers that bees work all spring. It spreads where the grass is thin and hungry.
The fix: clover is a symptom, not really the problem — it fixes its own nitrogen, so it wins wherever the lawn is underfed. Feed the lawn properly in October and it usually retreats on its own.
Feed the lawn first, then reassessHeart-shaped leaflets in threes, often mistaken for clover, with small yellow flowers. Underneath it there is a cluster of tiny bulbils, which is the whole problem.
The fix: never rotary hoe or dig it roughly — you scatter the bulbils and multiply it. Lift it carefully with the bulbs intact, or exhaust it by removing every leaf as it appears, and mulch deeply to slow it down.
Patience, not power toolsThe dandelion look-alike: a flat rosette of hairy, lobed leaves pressed to the ground, with yellow flowers on wiry stems that a mower rides straight over.
The fix: it runs on a deep taproot, so pulling the top off just prunes it. Get the whole root out with a weeding knife when the soil is damp, or spot-treat. Mowing alone will never beat it.
Dig the taproot while soil is softGlossy, bright yellow-green blades that shoot above the lawn within days of a mow. Roll a stem between your fingers and it is triangular — that is how you know it is not a grass at all.
The fix: pulling it is worse than useless, because the nuts stay in the soil and each one sends up several new plants. It needs a selective product made for nutsedge and usually more than one application over a season.
The one that genuinely needs a productA weed that flowers is a weed you will be pulling again next year, and most of these set seed within a fortnight of flowering. If you only have twenty minutes, spend them taking the heads off everything that is about to flower rather than perfectly clearing one bed — it is the single highest-return weeding you can do in spring.
Work out where to start
Most gardens come out of winter needing four or five things at once, and the order matters more than the effort. Tick whatever applies and this will put them in the right sequence, with a rough idea of how long you are in for.
Tick everything that sounds like your garden right now
Tick whatever applies to your garden and this will lay the jobs out in the order that saves you the most work. The sequence is not arbitrary — nearly every one of these makes the next one easier, and doing them backwards means doing several of them twice.
If you are worried about your soil coming into spring, liquid fertiliser is a good place to start. It is available to the plant almost immediately, which makes it the right tool when you want a controlled boost rather than a slow build — and it is far more forgiving than granular fertiliser on a dry bed, where undissolved granules can sit against roots and burn them.
Sydney soil is not one thing. Closer to the coast and through the sandy pockets it drains fast and holds almost no nutrition, so anything you apply washes straight through and needs to be topped up little and often. Out west and through the Hills it is heavy clay: nutrient-rich but tight, badly drained when wet and set like concrete when dry. Sand needs organic matter to hold water; clay needs gypsum and organic matter to open it up. Compost fixes both, which is why it is worth making.
Liquid feeds the plant now and is gone in a couple of weeks — ideal for a pick-me-up, for pots, and for anything looking hungry. Granular and slow-release feed the soil over two or three months, which is what you want on a lawn in October. Most gardens do best with a granular application as the soil warms, topped up with liquid through the growing season.
The other thing worth knowing before you buy anything is whether water is actually getting in. If it beads on the surface and runs off rather than soaking through, the soil has gone hydrophobic — extremely common in the sandy pockets and in any pot that has fully dried out over winter. No amount of fertiliser fixes that; a granular or liquid wetting agent does, and spring is the right time to apply it, well before you need the soil to hold water.
Keeping the garden maintained through spring genuinely adds value to a home, and it is the cheapest presentation work you can do — tidy hedges and a mowed lawn change how a place reads from the street more than almost anything else you could spend the same money on.
Start a compost this spring
Compost fails for one of two reasons: too much wet green material, which turns it into a smelly sludge, or too much dry brown material, which means nothing happens at all. Get the balance roughly right and Sydney’s spring warmth does the rest.
The old advice is to site the compost as far from the garden as possible because it attracts insects. A well-run bin does not attract much at all — what attracts vermin is meat, dairy and exposed wet scraps. Keeping it out of the vegetable patch and away from the back door is sensible insurance, but somewhere shaded and convenient beats somewhere far away that you stop walking to in February.
Timing beats technique
Pruning something that is in bud or in flower is the most common way to lose a season of display, and it is entirely avoidable. The rule for almost everything in a Sydney garden is: prune it in the weeks right after it finishes flowering. That gives the plant the longest possible run to set next year’s buds.
The most common piece of spring damage we get called out to is a scalped lawn. The logic is understandable — it has got long and shaggy over winter, so you drop the mower right down and take it all off at once, hoping to reset it. What you actually get is a yellow-brown patchwork that takes six weeks to recover, if it recovers at all, because the leaf that was doing the photosynthesising is gone and the exposed soil dries out and lets weed seed in.
The rule is never more than a third of the leaf blade in a single cut. That sounds slow, but it usually means three cuts spaced a week apart, and a lawn treated that way is genuinely back to normal inside a fortnight rather than limping through to Christmas.
Once it is back to a normal height, the spring lawn routine is short: mow every two to three weeks in September, weekly by November, feed once in October when the soil is warm, and deal with any bare patches while the runners are running. Aeration and top-dressing, if the lawn needs them, are spring-only jobs — both stress the grass briefly, so they need growth to recover into. Our lawn care checklist has the whole year set out if you want to tick it off.
A blunt blade tears the leaf rather than cutting it, and a torn tip browns off within a day — a whole lawn of them looks scorched even though nothing is wrong with it. It is a ten dollar job at a mower shop and it makes more visible difference than most fertilisers. Get in before September, because the queue starts the moment the weather turns.
The planting window
Spring in Sydney is not one planting season, it is three. September is still cool enough at night to kill a tomato seedling, October is when the whole thing opens up, and by late November you are planting against the clock before the heat arrives.
September
October
November
Anything that resents being moved — carrots, beetroot, radish, beans, corn, peas — goes in as seed, sown where it will grow. Anything with a long lead time and a small window, like tomatoes, capsicum and eggplant, is worth buying as a seedling unless you started seed indoors back in August. Whatever you plant, water it in with a seaweed tonic: it is not a fertiliser, it is a transplant stress tonic, and it noticeably reduces the check a seedling takes.
The same warmth that gets your garden moving gets everything else moving too. Spring and summer bring a genuine variety of pests, and soft new spring growth is exactly what most of them are looking for. Aphids cluster on new tips. Caterpillars find brassicas within days of the cabbage whites appearing. Scale and mealybug build up quietly on citrus and gardenias with ants running up and down farming them.
Healthy soil, sensible feeding, watering in the mornings and consistent care will not keep insects out of your garden. Nothing does. What it will do is change how much damage they can cause, because pests find weak plants first and a strong plant recovers from a knock that would set a struggling one back months. The aim is not a sterile garden, it is a garden that shrugs most of it off.
They also arrive in a fairly predictable order, which is useful because it tells you what to be looking for. Aphids are first, from about September, on the softest new growth — roses, citrus tips, anything you have just fed hard. Cabbage white butterflies follow through October and their caterpillars will strip brassicas in days. Scale and mealybug build quietly on citrus, gardenias and indoor-ish plants all spring, usually noticed only when the ants farming them become obvious or the leaves turn sticky and then sooty black. Spider mite arrives with the first hot dry week. Queensland fruit fly becomes the serious one from November for anyone growing stone fruit, tomatoes or capsicum, and by then netting is the only reliable answer.
That black film on citrus and gardenia leaves is a fungus growing on the sugary honeydew that aphids, scale and mealybug excrete. Spraying the mould achieves nothing. Deal with the insects underneath — usually with horticultural oil, and by getting the ants off the trunk — and the black film weathers off by itself.
There are a few methods that genuinely cut the number of pests visiting each year. Companion planting is the best known: strongly scented herbs planted in and around the beds — basil, mint in a pot, marigolds, garlic chives, rosemary — make it harder for insects to find the plant they came for, because most of them locate food by smell. The same plants in flower feed the ladybirds, hoverflies and lacewings that eat aphids for you.
The rest is housekeeping. Do not let fruit sit and rot on the ground, because once it starts fermenting every creepy crawly in the neighbourhood comes running — and fallen fruit is how Queensland fruit fly keeps its numbers up. Clear spent annuals rather than leaving them to collapse. Check the undersides of leaves once a week in spring, because that is where nearly everything starts, and a problem caught at twenty aphids is a thirty second job.
A hose is the most underrated pest control there is — a firm jet of water knocks aphids and mites off and most never make it back. If you do spray, do it late in the day when bees have finished working, use the least aggressive product that will do the job, and treat the undersides of the leaves rather than the tops. Blanket-spraying in spring kills the predators along with the pests, and the pests always come back first.
Water early, between about 5am and 9am. There are two good reasons and one bad one, and the bad one gets repeated the most.
The first real reason is evaporation. The air is cool and still first thing, so almost all of what you put down actually reaches the roots. The same ten minutes of watering at midday on a warm, breezy October day loses a large share of itself before it gets anywhere. The second is disease. Watering late in the afternoon or after dark leaves foliage wet all night, and in Sydney’s humidity that is exactly the window fungal problems need — black spot on roses, powdery mildew on everything soft, and rust.
The reason you will hear most often is that water droplets act like a magnifying glass and burn the leaves. That one is largely a myth: droplets sitting on a flat leaf do not focus enough light to scorch it. It does not matter much, because the advice that comes out of it is right anyway — but it is worth knowing which reasons are real, because they tell you what to do when you cannot water in the morning. If you have to water late, water the soil rather than the foliage and the disease risk mostly goes away.
Spring is when watering habits get set for the year. A long soak once or twice a week sends roots down into cooler, damper soil; a light sprinkle every day keeps them in the top centimetre, where they cook in the first week of real heat. Sydney Water’s water-wise rules point the same way: hoses and irrigation before 10am or after 4pm, with a trigger nozzle or a timer.
One thing that trips people up: new plantings and established plants want opposite treatment. An established shrub wants a long soak once or twice a week so its roots chase the water down. A seedling or a plant that went in three weeks ago has roots only in the ball it arrived with, and that ball can dry out in a day even in damp surrounding soil. Water new plantings little and often for the first month, then start stretching the interval deliberately so they learn to look for water rather than waiting for it.
By the time December arrives the rules change again — longer mowing heights, deeper soaks, and a mulch top-up before the first real heatwave. Our summer gardening guide picks up exactly where this one leaves off, and the lawn care checklist has the whole year laid out season by season if you would rather just tick things off.
Worth avoiding
None of these are unusual, and every one of them costs somebody a season. If you take nothing else from this page, take these.
Who wrote this
Sydney is a genuinely good place to garden. The climate lets us work outside all year, most people have some space to make something of, and even an apartment balcony can carry a serious amount of green. Everything on this page comes out of doing it week in and week out across the city — the north shore, the inner west, out west and down south — and watching which gardens sail through summer and which ones struggle. It is nearly always decided in spring.
Lachlan Kavanagh
Operator of Sydney Gardeners
Questions
The calendar says 1 September, and that is when the clearing-up work starts — weeding, the first proper mow, mulch down. But the jobs that depend on growth, like feeding the lawn, aerating and patching bare spots, work far better once the soil has warmed to about 18°C, which around Sydney is usually October rather than September. Doing them a month early is the most common spring mistake.
Early to mid October for most Sydney lawns, once the soil is genuinely warm and the grass is visibly growing. A complete lawn fertiliser at that point is the most valuable single application of the year. Put the same product down in early September on cold soil and much of it feeds the winter weeds instead, or washes through before the grass can use it.
Prune camellias as they finish flowering, shape lilly pilly and other evergreen hedges before the big spring flush, and cut citrus back after the fruit comes off. Leave anything that is about to flower or already flowering — gardenias, hydrangeas, roses and murraya are all building towards their display through spring, and cutting them now removes it.
About 75 mm of coarse organic mulch across the beds. A thin scatter looks tidy and does very little; at 75 mm the soil is properly shaded, moisture holds and weed seed cannot get the light it needs to germinate. Keep it pulled back a few centimetres from stems and trunks, and soak the bed before you spread rather than after.
After both, every time. Mulch laid over live weeds hides them for a fortnight and then they come through it anyway. Mulch laid over fertiliser that has not been watered in keeps it dry and inactive. The order that works is weed, prune, feed, water it in thoroughly, then mulch.
Yes, and it is really the only time. Both jobs stress the lawn briefly, so they need to happen while the grass is growing hard enough to fill back in quickly — October and November are the window. Aerating a lawn in winter just leaves you with a lawn full of holes, and patches laid outside the growing season mostly do not take.
Start at every two to three weeks in early September and tighten to weekly by November as growth accelerates. Never take more than a third of the leaf blade in one cut — if the lawn has got away over winter, two cuts a week apart will bring it back without the yellow, scalped look that comes from doing it in one go.
Usually four. Winter grass is the soft, bright-green tufty one with fluffy seed heads — get it out before those open. Bindii is the flat ferny rosette that becomes prickles in October, and by spring it is too late, so diary it for June. Clover means the lawn is underfed rather than infested. Catsear or flatweed is the dandelion look-alike with a deep taproot that has to come out whole. Nutgrass is the odd one out: bright green, triangular stems, and pulling it makes it worse.
Mid-October for most of Sydney. Early September is tempting but a cold night will check a tomato seedling badly, and a plant put in three weeks later routinely overtakes one that went in too early. In the warmer western suburbs you can push it a little earlier; on the coast and in the cooler upper north shore pockets, wait. November plantings still crop, they just need more watching through their first fortnight.
Sow seed directly for anything that hates being transplanted — carrots, beetroot, radish, beans, peas, corn. Buy seedlings for things with a long lead time and a narrow window, like tomatoes, capsicum and eggplant, unless you started seed indoors in August. Water either in with a seaweed tonic, which is a transplant stress tonic rather than a fertiliser and noticeably reduces the check a young plant takes.
The soil has gone hydrophobic, which is very common in sandy Sydney soils and in any pot that dried out completely over winter. Organic matter in the soil develops a waxy coating that repels water, so it beads and runs off instead of soaking in. A granular or liquid wetting agent fixes it, and spring is the time to apply it — well before summer, when you actually need the soil to hold water. Adding compost and keeping the bed mulched stops it recurring.
For most gardens, no. Sydney soils are commonly slightly acidic, which suits the majority of what people grow. It becomes worth testing when something specific is sulking — azaleas, camellias, blueberries and gardenias all want acidic soil, while a vegetable bed prefers close to neutral and will show it by simply underperforming. A cheap test kit answers it in five minutes, and lime raises pH while sulphur or an acidic fertiliser lowers it. Both work slowly, so spring is the time to start.
It helps, though not as dramatically as it is often sold. Strongly scented herbs and flowers make it harder for insects to locate a target plant by smell, and when those companions flower they feed the ladybirds, lacewings and hoverflies that do the real pest control. Treat it as one layer among several — alongside healthy soil, weekly checks under the leaves, and clearing fallen fruit — rather than a barrier on its own.
Keep reading
What to do when December arrives — heat, humidity and holiday watering.
The whole year for the lawn, season by season — tick it off as you go.
The one spring job with the biggest return, and the one most often skipped.
Spring clean-ups
A spring catch-up — beds weeded, hedges shaped, lawn brought back and mulch down — then a regular schedule so it never gets away again. Free quotes across Sydney, seven days a week.
