Late winter is the last quiet moment in a Sydney tree’s year. In a few weeks the spring flush starts, sap moves, buds break, birds nest, and half the pruning that is straightforward in August becomes a bad idea in September.
The short version: prune deadwood, structural problems and deciduous trees now. Leave spring-flowering species, stressed trees and anything with a nest in it alone.
Getting the order right is worth more than the pruning itself, and the window is closing. If you are picking up from winter tree care on the North Shore, this is what to do with the last few weeks of it.
What should be pruned before spring?
Deadwood, at any time, but especially now. Dead limbs are brittle and come down in spring storms. They are also easiest to see before the new growth hides them. No live material is removed, so there is no seasonal restriction.
Deciduous trees, while the structure is visible. Liquidambars, plane trees, maples, ornamental pears, crepe myrtles, magnolias that have already flowered. Bare branches make crossing limbs, weak unions and poor structure obvious in a way a full canopy never does. Cuts made now also close fast once growth resumes.
Structural problems on any species. Crossing and rubbing branches, included bark at a union, co-dominant stems, over-extended limbs. Correcting structure before a growth flush means the tree puts its energy into the form you want rather than the one it had.
Storm-damaged limbs. Anything cracked, hanging or partially torn from the winter should come out before it is loaded with new foliage and the first southerly of the season.
Clearance work. Lifting the crown off a roof, a driveway, a path or a powerline before spring growth adds another season’s extension.
Fruit trees, mostly. Deciduous fruit trees are conventionally pruned while dormant. Citrus is different and is generally left until after harvest and after the frost risk, which in Sydney is a spring job, not a winter one.
Most of that is standard tree pruning work, and the reason to do it now rather than in October is simply that the tree recovers faster and you can see what you are doing.
What should be left alone?
Spring-flowering species, until after they flower. The flower buds are already formed on last season’s wood. Prune a magnolia, camellia, wisteria, lilac or a spring-flowering wattle now and you are cutting off this year’s flowers. Wait until they have finished, then prune.
Trees under stress. A tree that spent summer in drought, has recent root damage, or is showing dieback needs every leaf it has. Remove the deadwood and leave the live crown alone until it recovers.
Anything with a nest in it. This is the big one for spring. Native birds, their nests and their eggs are protected under the Biodiversity Conservation Act 2016 (NSW), and hollow-bearing limbs are habitat for possums, gliders and parrots. Spring is when nests are occupied. A responsible arborist inspects for nesting activity before starting and will stop work and reschedule if they find an active nest. That is not an inconvenience, it is the law and it is the right call.
Eucalypts, for anything beyond structural need. Eucalypts respond to heavy pruning with abundant epicormic regrowth, and that regrowth is weakly attached. Prune them for structure and safety, not for tidiness.
Palms, mostly. Palms are pruned to a completely different logic, do not respond to thinning, and over-pruning a palm damages it permanently.
Freshly planted trees. Young trees need formative pruning, but a tree in its first season needs its leaves more than it needs a shape.
Why does timing matter before summer?
Three reasons, and only the first is obvious.
Wound closure. Cuts made just before a growth flush close faster than cuts made when the tree is dormant and idle, or when it is heat-stressed in January. Faster closure means less time for decay organisms to get in.
Energy budget. A tree pruned heavily in early spring loses foliage right when it has just spent its stored reserves pushing new growth. That is the worst possible moment to take leaves off it.
Summer readiness. A crown that has had its deadwood and structural defects dealt with in August is in better shape for the storm season and for the heat. Caring for trees through heatwaves is easier when the crown is sound going in.
Is there a disease risk in pruning at this time of year?
Yes, and it is worth knowing about in Sydney specifically.
Myrtle rust (Austropuccinia psidii) attacks new growth on plants in the Myrtaceae family, which in a Sydney garden means lilly pilly, bottlebrush, tea tree, paperbark and eucalypts. It infects soft new shoots, which is exactly what pruning stimulates. Pruning susceptible species and then producing a flush of tender growth in warm, humid conditions can make an infection much worse (PLACEHOLDER: confirm and cite the current NSW DPI guidance before publishing).
Practical implications: do not prune lilly pilly hedges hard immediately before a warm humid spell, clean tools between plants, and do not move infected clippings around. More broadly, pruning tools move pathogens between trees, which is why a competent operator cleans between jobs. The signs of tree disease worth checking for before pruning are the ones you can spot from the ground.
What about hedges?
Hedges are the exception to most of the above, because they are managed as a form rather than as trees.
A late-winter trim before the spring flush is the standard approach: cut back the previous season’s growth so the new flush comes in dense and even. Then a second, lighter trim once the flush has hardened off.
Two Sydney-specific cautions. Lilly pilly is a Myrtaceae and carries the myrtle rust risk above, and psyllid damage is worse on soft new growth. And a hedge that has been left too long cannot be brought back in one cut: taking it back past the green growth into bare wood leaves brown patches that may never fill in on some species. That is a staged job over two or three seasons, which is a conversation to have before someone runs a hedge trimmer through it. See hedge trimming.
What should never be done at this time of year, or any other?
Topping. Lopping. Cutting major limbs back to stubs to make a tree smaller or to “give it a fresh start” before spring.
Tree lopping in this sense produces a mass of weakly attached epicormic regrowth, opens the trunk to decay through cuts the tree cannot seal, and leaves the tree more dangerous in five years than it was before. Spring makes it worse, because the tree responds to the injury with a huge flush of exactly that weak growth.
If a tree genuinely needs to be smaller, the operation is crown reduction to appropriate lateral branches, done to AS 4373. That is a different job with a different result and it costs about the same.
What should come out before the storm season?
Sydney’s severe weather is not confined to summer, but the spring and summer months bring the storms that bring trees down. Before that season starts, the things worth dealing with are: large deadwood over structures, hanging limbs from winter, trees leaning further than they were, cracked unions, and anything showing root plate movement.
Preparing trees for storms covers the inspection in more detail. The point about doing it now is availability: after the first big storm, every arborist on the North Shore is doing emergency work and the queue for planned pruning gets long.
When does the window close?
Practically, once buds break and the flush starts, the useful pre-spring window is over for live pruning. From that point, deadwooding continues year-round, spring-flowering species get pruned after they flower, and everything else waits.
The seasonal cycle then picks up again with autumn tree care.
Approval is the other thing to sort out before booking. Live pruning of protected trees is regulated under Chapter 2 of the State Environmental Planning Policy (Biodiversity and Conservation) 2021, with each council setting the detail in its development control plan, and Ku-ring-gai, Willoughby, Hornsby, North Sydney and Northern Beaches all differ (PLACEHOLDER: confirm current clauses). See council approval rules.
Frequently asked questions
When is the best time to prune trees in Sydney?
Late winter for deciduous trees and structural work, after flowering for spring-flowering species, and any time for deadwood. Avoid heavy pruning in the peak of summer heat and during the spring nesting period.
Can I prune in spring if I have already missed the window?
Deadwood, yes. Light corrective pruning, usually. Heavy live pruning, better to wait, and check for nests first regardless.
Will pruning before spring make my tree grow more?
It redirects growth rather than increasing it. A tree pruned in late winter puts its spring energy into fewer growing points, which is why formative pruning works best at this time.
Do I need council approval to prune my own tree?
Often yes for protected trees, and the thresholds vary by council. Check before booking, not after the cut.
What if there is a bird nesting in the tree?
Work stops. Native birds and their nests are protected, and the pruning waits until the nest is no longer active.
How much of a tree can be pruned at once?
AS 4373 sets limits on live foliage removal in a single operation, and a competent arborist works within them. Any contractor who cannot answer that question is not one to hire.
Book it before the flush starts
The pre-spring window is short and it is the same window everyone else on the North Shore is trying to use. Once the growth starts and the first storms arrive, planned pruning moves to the back of the queue behind emergency work.
G McColl works to AQF Level 5 across the North Shore and Northern Beaches, fully insured, and covers arborist services, tree pruning and hedge trimming.
Tell us what you have and we will tell you whether it should be done now or after spring. Book pruning before the spring flush, or call 0403 134 299.