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Pruning guide · Fruit tree
Black mulberry: when and how to prune
Morus nigra
Prune a black mulberry only when it is fully dormant, in November–January, and only lightly: remove crossing and low-hanging branches, and don’t saw off thick branches.
The black mulberry slowly grows into a broad, gnarled tree that can live for hundreds of years. It needs little pruning, and copes badly with large wounds: they heal slowly and let disease in. So pruning is mainly about giving a young tree a good shape and then doing little. Timing is important: outside deep winter dormancy, a mulberry bleeds heavily from every wound.
| Pruning months | November–January |
|---|---|
| Nesting season (15 March–15 August) | Outside it |
| Flowering | May |
| Good for bees, butterflies and birds | Yes, for birds |
| Native to Belgium | No, planted |
Black mulberry: when to prune it?
Prune only when the tree is fully dormant, in November–January, after leaf fall.
Don’t prune in spring or early summer: it then bleeds heavily and loses a lot of sap.
Saw off branches dying back from coral spot in winter, back to healthy wood.
What else to prune in those months? January · November · December
Black mulberry: how to prune it?
- Give a young tree a sturdy trunk and a few well-spaced main branches. Remove crossing and low-hanging branches.
- Don’t saw off thick branches: better to prune a little every year than a lot every few years.
- Saw off a branch that really has to go just outside the branch collar, in three steps, so the bark doesn’t tear.
- Old trees may grow crooked and gnarled. Prop up a heavy, overhanging branch with a post rather than sawing it off.
- Remove dead branches, and branches with small coral-pink pustules or sunken patches in the bark.
How much to cut, and how often?
- Little: a mature tree often needs nothing for years, apart from dead wood.
- A young tree: a little formative pruning each year, until it has a good trunk and crown.
What does it mean for wildlife?
- Pruning in winter falls outside the nesting season (15 March–15 August): that way you don’t disturb birds nesting in the broad crown.
- The purple-black mulberries in July–August are a feast for blackbirds, starlings and thrushes. There are usually enough for everyone.
- Old, gnarled mulberries develop hollows and cracks where insects, bats and hole-nesting birds such as tits find a home. Leave them if they pose no danger.
- Plant it over grass, not over a terrace or drive: the fallen fruit stains badly, but in the grass it feeds hedgehogs and butterflies.
Common mistakes
- Pruning in spring, so the tree bleeds heavily.
- Sawing off thick branches, leaving large wounds that heal slowly.
- Cutting an old, crooked tree back hard instead of propping it up.
- Planting it over a terrace or drive, and then sawing off the branches that drop staining fruit every year.
Caution: Bleeds heavily if you prune in spring or early summer.
Nearby: related pruning guides
Similar to: Difference from white mulberry · Difference from large-leaved lime
Plant profile: Black mulberry · Pruning calendar and basic rules