What to Prune in Winter in Melbourne (and What to Leave)

Winter is the busiest pruning season for a reason: most deciduous trees are dormant, their structure is visible, and cuts heal cleanly before spring growth. But "prune everything in winter" is wrong, and pruning some trees now will cost you a season of flowers or stress the tree. Here's a straightforward guide to what to prune in a Melbourne winter, and what to leave alone until later.

Why winter is the main pruning window

For deciduous trees, dormancy is the ideal time to prune. With the leaves gone, the branch structure is fully visible, so you can see exactly what to cut. The tree is resting, storing energy in its trunk and roots, so cuts stress it less and heal faster. And there's far less disease pressure in the cold than in the warm, humid months. In Melbourne, that dormant window runs roughly June to August.

Prune these in winter

Most fully-deciduous trees are good candidates for winter pruning once they've dropped their leaves:

• Ornamental pears (Pyrus): winter is ideal, and structural pruning matters because they split at tight unions. (We've written a full guide to pruning ornamental pears.)
• Ornamental and deciduous elms: prune while dormant for shape and structure.
• Oaks (English, pin, algerian): dormant-season pruning is best; these are common and often protected in Boroondara, so tread carefully.
• Maples, ginkgo, liquidambar, crepe myrtle, jacaranda: all prune well when fully defoliated in winter.
• Any deciduous tree needing deadwood removal or a crown reduction: winter is the clean, low-stress time to do it.

Leave these until after they flower

This is where winter pruning goes wrong. Some trees set their flower buds on old wood, so pruning them in winter cuts off this spring's display before it happens:

• Spring-flowering ornamentals like flowering cherries and plums (Prunus): these are best pruned straight after they flower, not before. Prune them now and you remove the blossom you were waiting for. Prunus is also prone to disease through fresh cuts, so timing matters.
• Magnolias: minimal pruning, and after flowering if at all.
• Other spring bloomers: as a rule, if it flowers in early spring on bare wood, prune it just after the flowers finish, not in winter.

Evergreens and gums: a different rhythm

Australian natives and evergreens don't follow the deciduous winter rule. Eucalypts and other gums are generally best given lighter attention, deadwood removal and canopy management, outside the coldest and the hottest extremes, and often before storm season rather than in deep winter. The priority with gums is usually safety: removing deadwood and reducing end-weight on limbs over houses, driveways and boundaries before summer storms.

The rule that covers most cases

If it's deciduous and it's dropped its leaves, winter is usually a good time to prune it. If it flowers in spring on bare branches, wait until just after it flowers. If it's a gum or evergreen, it's less about season and more about safety and structure, checked before storm season. And whatever the tree, keep pruning light and to the Australian Standard (AS 4373-2007); heavy cutting and topping cause more problems than they solve.

One Boroondara-specific reminder: many established trees here are protected canopy trees (trunk circumference of 110cm or more at 1.4m), and pruning them still has to meet the standard and not damage the tree. If you're not sure whether your tree is protected or the right time to prune it, that's exactly the kind of thing worth checking first.

Not sure what's safe to prune this winter? Send us a photo and your suburb and we'll tell you what needs doing now and what's better left.