Prune Japanese maples in full dormancy, from late autumn to midwinter, roughly November to January. Avoid pruning in late winter and spring, because this is when acers bleed sap heavily from any cuts, which weakens the tree.
The good news is that Japanese maples need very little pruning to look their best. Here is when and how to do it properly.
Acers barely need pruning
Acer palmatum and its relatives have a naturally elegant shape, so the goal is to enhance it, not reshape it. Most of the time all you need to do is remove any dead, damaged or crossing branches. Heavy pruning spoils the natural form and is rarely necessary. Browse our Japanese maples to see the range of natural shapes, from upright to weeping.
The best time to prune
Prune when the tree is fully dormant and the leaves have dropped, from late autumn into winter. At this point the sap is not rising, the branch structure is clearly visible, and cuts heal cleanly. The one time to avoid is late winter into spring, when rising sap causes acers to bleed from pruning wounds. Light shaping in midsummer, around July and August, is also fine once the leaves have hardened off.
How to prune a Japanese maple
- Start by removing anything dead, diseased or damaged.
- Take out branches that cross or rub against each other.
- Thin lightly to open up the canopy if it is congested, always cutting back to a junction or the main stem.
- Step back often and keep the natural, layered shape. Less is more.
Acers in pots
Potted Japanese maples follow exactly the same timing. Prune in winter, and use the opportunity to check the roots and top up fresh compost if needed. Acers are some of the finest plants for pots and patios, and their dappled canopy is happiest in the light shade and woodland conditions that scorch tougher plants.
Explore our full range of Japanese maples, from fiery reds to golds and greens, and see the wider outdoor plants range to build the rest of the scheme.