How to prune a sweet cherry tree (Prunus avium): pruning guide

Why prune a sweet cherry tree?

Sweet cherry trees (Prunus avium) naturally grow to 20-30 metres tall. In your front garden, stop that - prune. But pruning is different from apples or plums. Cherry trees react sensitively to deep cuts. They bleed sap, attract fungi. Caution is needed.

Good news: with some knowledge and timing, you need less pruning. A healthy cherry tree shapes itself reasonably well. Your main task is maintaining tight, healthy structure and preventing disease.

Step 1: Understand sweet cherries

Sweet cherry trees fruit on branches two years old and older. They need lots of sun for ripening. They flower early (March-April), so frost-sensitive. Many types are self-sterile - you need at least two different cultivars for pollination.

Typical cultivars: 'Kordia', 'Sweetheart', 'Stella', 'Napoleon', 'Germersdorf', 'Regentag'.

Step 2: Timing is everything

This is crucial. NEVER prune sweet cherries in autumn or winter. The tree "bleeds" sap from cuts, loses much moisture, and fungi like leaf curl take hold.

Correct timing: late May through end July. The tree still grows, recovers quickly, and wounds can dry properly before autumn.

Winter? Wait until May. No exceptions.

Step 3: Shape young tree (year 1-3)

Plant your tree in March. Let it grow. In May, when it reaches 120-150 cm, gently begin shaping.

Goal: an open vase-shaped crown with 4-5 main branches. This ensures good light and air circulation.

Prune carefully. Remove only crossing, parallel-running or downward-hanging branches. Side shoots? Leave them for now. Let the tree save more energy than you remove.

By end of year three you have an open, healthy structure.

Step 4: Remove dead branches

Dead wood feeds fungi. If you see branches that are completely brown, leafless, cut them off - preferably at clean branches close to healthy wood.

Use a saw for thick dead branches. Make cut near the healthy side. Use a razor-sharp saw. Blunt sawing tears fibres, fungi invade.

Step 5: Thin, do not head back

This is the key difference from other fruit trees. With cherries: cut entire branches off at the base (the branch collar where they originate). Cut never halfway along branches.

Why? Half-cuts bleed lots of sap, create large wounds that attract fungi. Whole branches cut? Smaller wound surface, less infection.

So thin out closely, but carefully. Cut only truly necessary branches away.

Step 6: Open the crown

If your tree gets dense after 5-6 years, thin. Goal: light and air through all layers.

Work top to bottom. Remove:

• Vertical shoots growing inward
• Two branches crossing - remove the weaker
• Lower branches shaded by upper ones

After thinning your tree looks sparse, but that is good. In May/June it thickens again.

Step 7: Do not seal wounds

Research shows cherry trees heal better when you leave large wounds open. Your tree forms its own protective layer.

Avoid wound dressing if possible. One exception: very large wounds (deeper than 5 cm) in extremely wet seasons - then a little might help against moisture penetration. But usually not needed.

Step-by-step sweet cherry pruning

Step 1: Right season - May through July

Never prune outside this window. No exceptions.

Step 2: Keep tools sharp

Sharp saw, disinfect between trees. Blunt tools = fungi.

Step 3: Cut whole branches

Cut near the base (branch collar). Never cut halfway along.

Step 4: Remove dead wood

All brown, leafless branches off, prevent fungal infection.

Step 5: Open the crown

On mature trees: thin carefully, allow light and air through.

Step 6: Handle downward branches

These give less fruit. If you can remove them, better.

Step 7: Prune minimally

Cut only what is truly necessary. Cherries recover slowly from deep pruning.

Frequently asked questions

How much can I safely prune?

Maximum 20% of crown per year. More stresses the tree extremely. Limit: 2-3 thick branches per tree per season.

My cherry tree "bleeds" sap. Is that bad?

Sap-bleeding means the tree recovers poorly - probably because you pruned in the wrong season. This year: wait and observe. Next year: May through July.

As for sap-bleed: it is not serious as long as you time better next go.

Can I prune young for shape?

Yes, gently. Young trees (year 1-2) tolerate lighter pruning than mature ones. Focus on basic form. Heavy pruning waits until the tree grows independently.

When can I expect first harvest?

Sweet cherries fruit on 2+ year old wood. Year two after planting: maybe a few clusters. Full harvest? Year 4-5.

What diseases should I watch for?

Leaf curl (Taphrina deformans) - green, curling leaves. Especially in wet springs. Prevention: good light (thinning), no pruning in autumn/winter, disinfect tools.

Gummosis - amber-coloured gum along trunks. Sign of stress. Support tree health first: good drainage, minimal pruning.

Canker (bacterial shot-hole) - rare but serious. Disinfect tools with 10% bleach.

Can I train sweet cherries as espaliers?

Yes, but difficult. Sweet cherries are vigorous and respond less well to horizontal bending than plums. Better: normal form or half-open shape.

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