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Pruning guide · Shrub
Cornelian cherry: when and how to prune
Cornus mas
Prune a Cornelian cherry after flowering, in March–April, and if needed give a hedge another light trim in August: only remove dead, crossing and overlong branches, as it needs little pruning.
The Cornelian cherry is a native shrub or small tree of 3–6 m that flowers as early as February–March, with countless little yellow balls on the bare branches. It grows slowly, lives to a great age and develops a pleasing, rounded shape on its own. So pruning is mainly a matter of doing little. It already forms next spring’s flower buds in summer, on short side shoots: if you cut a lot in summer or winter, you get few flowers the following spring.
| Pruning months | March–April and August |
|---|---|
| As a hedge | March–April and August |
| As a free-standing shrub | March–April |
| Nesting season (15 March–15 August) | Take care in March–April and August |
| Flowering | February–March |
| Good for bees, butterflies and birds | Yes, for bees and birds |
| Native to Belgium | Yes |
Cornelian cherry: when to prune it?
As a hedge
As a free-standing shrub
Prune straight after flowering, in March–April. You have enjoyed the early blossom, and the shrub has all summer to form new flower buds.
A clipped hedge can be given another light trim in August. Don’t cut deeper than necessary: every twig you cut off is one flower fewer in spring.
Don’t prune in autumn or winter: you would cut off the flower buds that are already waiting.
Cornelian cherry: how to prune it?
- First remove dead and diseased branches, then branches that cross or grow inwards.
- Cut overlong branches back to a side branch pointing outwards, not just to length: that way the natural shape is kept.
- If you want a small tree, gradually remove the lowest branches over a few years until you have a clear trunk.
- Trim a hedge into shape after flowering, slightly narrower at the top than at the bottom, and in August only the odd stray shoot.
- Rejuvenate an old, oversized shrub over several years: each time after flowering, saw one or two of the oldest stems off at the base. It regrows slowly but surely.
How much to cut, and how often?
- Little: a free shrub often needs nothing for years, apart from a dead or crossing branch.
- A hedge: one trim after flowering, and possibly a light second one in August.
- The less you cut in summer, the more it flowers and the more cornels you harvest in August–September.
What does it mean for wildlife?
- March–April already falls in the nesting season (from 15 March). Before you prune, check that no blackbirds, song thrushes or chaffinches are nesting in the shrub, and spare an active nest.
- The blossom in February–March is one of the very first meals for honeybees, wild bees and bumblebee queens emerging from hibernation.
- The red fruits feed blackbirds, thrushes and starlings in late summer. If you want to harvest some yourself, leave the birds a share.
- An old Cornelian cherry with dense branches is a shelter for small birds all year round. Stack the prunings in a dead hedge.
Common mistakes
- Pruning in winter or autumn, so the flower buds are gone.
- Clipping a free shrub all over every year, so it hardly flowers or fruits.
- Taking off too much at once on an old shrub: it grows slowly and needs years to make up for it.
- Pruning after mid-March without first checking for nests.
Caution: March–April already falls in the nesting season: check for nesting birds before you prune.
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Plant profile: Cornelian cherry · Pruning calendar and basic rules