Bonsai defoliation is a technique that involves removing some or all of the leaves from a tree during the summer. By doing this, you stimulate the tree to produce new leaves, resulting in smaller leaf size and increased branching.
Which Trees Can Be Defoliated?
Most deciduous trees can undergo defoliation, but it's important to consult our Tree Species Guides as some trees may not respond well to this technique. Avoid defoliating weakened trees (such as those recently repotted, pruned, or affected by disease) or trees that are still in the training process.
Defoliation can also be used to control growth in specific parts of the tree. For instance, you may choose to defoliate the top portion of the tree while leaving the bottom part untouched. This helps restore balance within the tree.
When to Defoliate?
For most bonsai tree species, the best time to defoliate is in June. This allows sufficient time for the tree to grow new leaves and prepare for the upcoming winter season. The exact timing may vary depending on the specific tree species, but generally, defoliate after the new spring growth has hardened off.
When cutting the leaves, we do not remove the leaf-stalks.
How to Defoliate a Bonsai Tree
To defoliate a bonsai tree, use twig shears to cut the leaves, ensuring that the leaf stalk remains intact. It is beneficial to use the appropriate bonsai tools, such as a leaf cutter, for this task.
After defoliation, the tree does not require any specific aftercare. However, when partially defoliating a tree (such as pruning only the top part), it is advisable to place the tree in a shaded area for about a month to protect the exposed interior leaves. In regions with intense sunlight, you can provide shade for the defoliated trees to prevent sunburn on the bark.