The Cercidiphyllum japonicum, commonly known as the Caramel Tree, is a prized ornamental tree renowned for its highly decorative foliage, which turns splendid autumn colours. Native to Japan and China, this tree forms a majestic silhouette that can reach 12 to 15 metres in height. It features heart-shaped leaves that take on purple hues in spring when they emerge, turn green in summer, and then transform into yellow to coppery-red shades in autumn before falling. As they drop, they release a caramel or gingerbread-like fragrance, earning it the nickname "Caramel Tree." Although the Cercidiphyllum is not a demanding tree when it comes to pruning, a few well-considered interventions can enhance its health and beauty. Discover our tips for pruning it correctly!
Feel free to also check out our comprehensive guide on growing Cercidiphyllum.
Why prune the Caramel Tree?
The Cercidiphyllum does not necessarily require pruning; generally, it can do without this intervention. However, in some cases, pruning can be beneficial. It allows for the removal of dead, diseased, or damaged branches, reducing the risk of disease and promoting the flow of sap to the healthy parts of the tree. This limits the risk of fungal or parasitic infestations. Pruning also helps maintain a beautiful structure. Even though the Caramel Tree naturally has an elegant silhouette, pruning can help balance its shape, especially if some branches grow haphazardly. It can also help control its size, which may be useful if you have a small garden or limited space. Finally, pruning improves air circulation and light exposure, promoting the tree's overall health.
When to prune the Caramel Tree?
The best time to prune the Cercidiphyllum is in late winter to early spring, just before the growing season resumes. At this time, the tree is still dormant, reducing the stress of pruning and promoting quick wound healing. It is also possible to prune in autumn, after the leaves have fallen.
Essential tools
- A sharp pruning shear: Ideal for small branches up to 2 cm in diameter.
- A lopper (or branch cutter): Perfect for thicker branches, up to 5 cm in diameter.
- A pruning saw: Necessary for the largest branches.
- Gardening gloves: To protect your hands from cuts and splinters.
- Disinfectant (methylated spirits or diluted bleach solution): To clean the blades after each cut, especially if you have pruned diseased branches.
- Pruning sealant to promote healing on larger pruning wounds.
Safety tips
If you need to work at height:
- Use a stable stepladder.
- Wear safety goggles to avoid sawdust or small debris.
- Ensure the area is clear to prevent any risk of falling branches on people or objects.
How to prune the Caramel Tree?
Let’s get practical! Pruning a tree might seem daunting, but by following these steps, you’ll find it’s simpler than it appears.
1- Observe the tree before pruning
Before you start, take the time to observe your tree from different angles. Identify dead, diseased, or damaged branches, as well as those that cross or seem poorly positioned. Also, note branches that disrupt the tree’s natural shape. Visualise the harmonious silhouette you want to achieve after pruning.
The idea is to keep the tree’s natural structure in mind, intervening lightly and thoughtfully.
2- Remove dead or diseased branches
Start by cutting dead branches, recognisable by their dry and brittle appearance, often lacking buds. If you spot diseased branches (with spots, fungi, etc.):
- Cut well below the affected area.
- Disinfect your tools between each cut to prevent the spread of disease.
3- Thin out the tree’s centre
To improve air circulation and light penetration:
- Remove branches that cross or touch, as they may hinder each other’s growth.
- Thin out inner branches if the tree’s centre is too dense. This will also highlight the tree’s beautiful structure.
4- Balance the tree’s silhouette
If you want to harmonise the tree’s shape:
- Shorten branches that disrupt the silhouette slightly.
- Make clean cuts just above an outward-facing bud. This encourages outward growth, preventing the tree from becoming too dense.
- Angle the cut slightly so rainwater drains easily, reducing the risk of rot.
5- What to do with thick branches?
For thick branches:
- Start by making a relief cut on the underside of the branch, about 20 cm from the trunk, to prevent it from tearing as it falls.
- Then make the main cut a few centimetres further out.
- Finish with a clean cut near the trunk, without damaging the collar (the slightly swollen area at the base of the branch), as this is where healing is most effective.
Our additional tips for a thriving Cercidiphyllum
- Apply pruning sealant to larger wounds to minimise the risk of disease.
- Monitor regrowth: In spring, observe how the tree responds to pruning. This will help you adjust your approach for future years.
- Avoid severe pruning! The Cercidiphyllum does not tolerate drastic pruning well. It’s better to prune lightly each year than to make heavy corrective cuts.
- Water well after pruning, especially during dry spells. This helps the tree recover from stress.
- Consider mulching around the base of the tree to retain moisture and protect the roots from temperature fluctuations.
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