Japanese maple: when and how to prune

Acer palmatum

A Japanese maple hardly needs pruning: remove dead and crossing twigs in summer, in July–August, or after leaf fall, in November–December, and never in late winter or spring, as it bleeds.

A Japanese maple owes its beauty to its natural shape: layered, finely branched limbs that no amount of pruning could recreate. Here, pruning is mainly about holding back: a few dead or crossing twigs, a shoot below the graft, and nothing more. Timing does matter, though: from late winter into spring the sap is rising, and it then bleeds from every wound.

Updated on 10 October 2026

Key facts
Pruning months	July–August and November–December
Nesting season (15 March–15 August)	Take care in July–August
Flowering	April–May
Good for bees, butterflies and birds	Little
Native to Belgium	No, planted

Japanese maple: when to prune it?

In summer, in July–August, you can spot dead twigs at once: they have no leaves. Wounds also close quickly then.

After leaf fall, in November–December, you can see the shape of the branches best and decide calmly which twig should go. Don’t prune when it is freezing.

Don’t prune from late winter into spring, when the sap is rising: the maple then loses a lot of sap from every wound, which weakens it.

What else to prune in those months? July · August · November · December

Japanese maple: how to prune it?

Use small, sharp secateurs and, for a thicker branch, a fine pruning saw. Disinfect your tools before you start: that way you won’t pass on verticillium wilt.
Cut out dead, diseased and crossing twigs, close to a side branch or the branch they grow from. Don’t leave stubs.
Follow the natural shape: choose the twig that spoils the layered structure, and leave the rest. Never cut all the branches back to length: a thicket of upright shoots follows, and the graceful shape is lost for years.
On a grafted variety, remove shoots coming from below the graft; you can recognise them by their different leaves, often green and less finely cut.
If branches suddenly wilt in summer, sometimes on one side only, and the wood shows dark streaks, it is verticillium wilt: cut them back into healthy wood and disinfect your secateurs afterwards.
If you want to see or walk under a small tree, remove the lowest branches one by one, spread over a few years.

How much to cut, and how often?

As little as possible: most Japanese maples need no pruning for years, apart from the odd dead twig.
Never remove more than a fifth of the crown in a year. Reduce a maple that has grown too big over several years, twig by twig, back to a side branch.
If it is too cramped, move a young plant to a roomier spot instead, or choose a dwarf variety for a pot: then you won’t need to prune.

What does it mean for wildlife?

In May it bears small, purplish-red flowers. They are easy to miss, but bees and bumblebees find them all right.
The summer prune in July–August falls in the nesting season (15 March–15 August): blackbirds, chaffinches or dunnocks sometimes nest in a dense, layered small tree. Look carefully first, as disturbing an active nest is against the law. Pruning in November–December falls outside it.
Ladybirds, hoverfly larvae and tits usually clear the aphids in spring by themselves: there is no need to spray.
Leave the fallen leaves under the tree: they turn into leaf mould, protect the shallow roots and give hedgehogs and insects a place to overwinter.

Common mistakes

Pruning in late winter or spring, so the maple bleeds heavily.
Cutting all the branches back to length, so thickets of upright shoots appear and the natural shape is lost.
Leaving shoots from below the graft until the rootstock overgrows the variety.
Going from a diseased maple to a healthy one with dirty tools, so verticillium wilt spreads.
Pruning in summer without checking for nests first.

Caution: Don’t prune from late winter through spring: the maple then bleeds a lot of sap from every wound.

Nearby: related pruning guides

Plant profile: Japanese maple · Pruning calendar and basic rules