Bonsai leaf pruning on a hornbeam: defoliating to reduce the leaf size

If a leaf does not get enough light, it dies and the tree forms too small buds in the “leaf axil”. These small buds only sprout weakly the next year and slowly die off. If you lose many branches, the branching will not grow densely enough. This weakens the tree.

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Bonsai design

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LeavesLeaf pruningShaping
Instructions

Why do you prune leaves? 1. for denser branching.
2. so that the leaves can receive light evenly.
3. to prevent the inner branches from dying off. When do you prune leaves? You can start the first leaf pruning in mid-May, when the leaves have grown large enough. If yellow leaves appear on the inside of the crown, the crown is too densely covered with leaves and you need to thin out. Always prune the leaves by feel. This depends on the time of year, the stage of growth, the variety and the health of the tree. 1. classic "two-leaf pruning" Cut back the new shoot after the 2nd leaf or pair of leaves. You can generally use this technique on all tree varieties. The first leaves on the new shoots are usually small, the second are already larger and so on. The first leaf is left untouched, the second is cut in half. When do you do this? Usually at the end of May, until the end of June, when the leaves are big enough.

Figure 1
1

Hornbeam carpinus betulus
A shoot that is large enough before leaf pruning. (Hornbeam-Carpinus betulus)

Figure 2
2

This is what pruning looks like. If the first leaves are too small, you can leave them as they are.

Figure 3
3

Example of this leaf pruning method. Most deciduous trees are tip dominant, which means that new leaves grow back faster at the top than at the bottom, so we leave more green mass in the lower area. (you leave 2 leaves at the top, 3-4 at the bottom)

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