Pruning London Plane
When and how — Platanus × acerifolia
Prune your london Plane in November, December and January — the optimal month is usually December.
The next pruning window is November.
When to prune?
The tree london Plane is pruned in November, December and January.
Prune trees for structure and health, not productivity.
Tree pruning is almost always about crown shape and health, not flowering or fruit. Good tree pruning starts in the first ten years: you set the framework with three to five strong scaffold branches that leave the trunk at an open 45–60° angle. After that, prune mainly to remove dead, diseased or crossing wood. Heavy renovation pruning later in life triggers masses of watershoots and weakens the tree — better to do light corrective pruning every two or three years than one drastic intervention per decade. Timing follows the sap flow: deciduous trees during winter dormancy (December to February, except birch and walnut which 'bleed'), conifers any time of year except during frost.
How to prune london Plane
London plane requires minimal pruning once established, but formative pruning in the early years helps develop a strong framework. Prune during dormancy in November, December, or January to reduce sap bleeding and avoid stress. Never prune in spring or summer when the tree is in active growth. For young trees, focus on establishing a clear central leader and removing competing leaders or crossing branches. Cut back any low laterals that might obstruct pathways or sightlines, aiming for a clear trunk of at least 2 to 3 metres. Use sharp bypass secateurs for small branches and a pruning saw for anything thicker than your thumb. Always cut just outside the branch collar—the slight swelling where the branch meets the trunk—to promote natural healing. Mature London planes rarely need pruning beyond removing dead, damaged, or diseased wood. Check annually for broken branches, especially after storms, and remove these promptly to prevent decay entering the main trunk. If branches overhang buildings, roads, or utilities, hire a qualified tree surgeon; large limbs are heavy and dangerous to remove without proper equipment and training. Avoid heavy crown reduction or topping, which disfigures the tree and encourages weak, vigorous regrowth prone to disease. London plane naturally sheds its bark in irregular patches, revealing cream and grey mottled wood beneath—this is normal and not a sign of ill health. If you notice cankers, oozing lesions, or dieback, consult an arborist, as plane anthracnose and other fungal diseases occasionally affect stressed trees.
Common mistakes
✗ Cutting flush to the trunk
Remove branches just outside the branch collar (the swelling at the base), not flush to the trunk. The collar contains the cells that seal the wound — cut those off and the wound won't heal, giving rot a clear path in.
✗ Topping to limit height
Drastically shortening the leader triggers massive watershoot growth and permanently weakens the tree. Want a smaller tree? Choose a smaller species at planting time, or replace the tree.
✗ Painting wounds with sealant
Once standard, now outdated: wound paint traps moisture and actually encourages rot. A clean cut at the right moment heals on its own.
Hold off on pruning
Better to wait than prune at the wrong moment. The next optimal window is November. Until then: leave the plant alone — only remove dead or diseased wood (which you can do year-round).
