Growing a healthy and harmonious bonsai is an experience that goes far beyond simply caring for a plant: it is an art form and a discipline that requires patience, observation, and, above all, knowing how and when to intervene on its branches and roots. Among all the tasks, the pruning It is undoubtedly the main tool with which both beginners and advanced hobbyists give shape and life to these miniature trees.
Pruning a bonsai isn't just an aesthetic exercise. Doing it correctly is essential to maintaining its health, promoting its development, and avoiding numerous problems over time.
Why is it essential to prune a bonsai?
Each cut made on a bonsai is much more than a matter of aesthetics. pruning fulfills several Key features: helps to shape the silhouette of the tree according to the desired style, stimulates the growth of new branches and leaves, strengthens the plant and allows you to maintain the correct proportions in small dimensions. In addition, proper pruning promotes air circulation between the branches, reducing the risk of diseases and pests, and allowing growth to be controlled so that the tree does not lose its miniaturized essence.
A properly pruned bonsai It is healthier, more balanced and more attractive. For this reason, pruning is considered a fundamental technique for amateurs of any level.
When is the best time to prune a bonsai?
Decide the optimal time to prune It depends on the species and the type of intervention the tree needs, but, broadly speaking, there are two key periods that are repeated in most species:
- Spring Season: This is the period of greatest growth, when sap flows actively and the tree responds well to formative and maintenance pruning. This is the best time to make cuts to encourage the emergence of new branches and leaves, and to shape the overall structure.
- Fall Season: This is the recommended time for light pruning, structural inspection, and preparation for winter dormancy. Growth slows and the tree strengthens against the cold.
Avoid drastic pruning in winter and summer unless you have experience or the species allows it, since trees are weaker during these seasons and can easily suffer damage.
What types of pruning exist in bonsai?
To achieve a harmonious bonsai, there are several pruning techniques that you should know and know how to differentiate according to the objective:
- Formation pruning: This is done at the beginning of a bonsai's development or when a major change in its structure is desired. It involves shaping the trunk and main branches to create the basis of the design. Significant cuts are applied and it is usually done in spring or late autumn.
- Maintenance pruning: Also called pinching, it is performed regularly throughout the growing season to maintain the achieved shape, control size, and encourage compact, dense foliage. It involves removing long shoots and leaves that extend beyond the desired profile.
- Root pruning: Essential for potted bonsai, it helps prevent the tree from getting out of control and keeps the root system compact. It's usually done during repotting, removing up to a third of the roots when renewing the substrate.
- Rejuvenation pruning: Less frequently, it is performed to stimulate regrowth in aged or weakened trees, removing stagnant branches and dead parts.
There is also the technique of defoliated (remove leaves in summer on deciduous trees such as ficus), which can promote the appearance of smaller leaves and additional branching, although it should be reserved for healthy, well-adapted trees.
Essential tools for pruning a bonsai
Making precise, clean cuts is essential to reduce stress on the tree and prevent infection. basic tools recommended by experts include:
- Special pruning shears for bonsai, which must be sharp and disinfected.
- Concave pruner, especially useful for thick branches: its cut facilitates rapid and aesthetic healing.
- Wire cutters for manipulating wire without damaging the bark when using wiring techniques.
- Fine watering can for subsequent irrigation.
- Sealant paste to cover large wounds and prevent the entry of pathogens.
always use clean and sharp tools To ensure the health of your bonsai, avoid using office scissors or large garden tools, as these can damage the tree beyond repair.
Preliminary steps and planning of pruning
Before making the first cut, it is advisable observe the bonsai from different anglesAnalyze the structure of the trunk, the distribution of the branches and decide which parts you want to enhance or eliminate. design planning right now is key, so take your time to avoid regrets.
Some useful guidelines for the decision:
- If two branches emerge at the same height, it is generally best to remove one to avoid swelling.
- Remove branches that are too thick at the top or have excessive vertical growth.
- Remove branches with unsightly curves or that hide the main front of the trunk.
- Maintain proportions: the lower branches should be thicker than the upper ones.
- Remove dead, damaged or diseased parts.
Place the bonsai at eye level to facilitate evaluation and precise cuts, achieving better results.
How to prune and pinch correctly?
La maintenance pruning It consists of shortening shoots and leaves that stray from the desired profile, preferably at the ends and upper parts of the tree. This controls the apical dominance, a natural phenomenon that causes the upper branches to grow more vigorously, potentially leaving the lower branches without sufficient light and sap.
In deciduous species, it is enough cut with clean scissors Excess growth. On pines and conifers, it is recommended to pinch off with your fingers to prevent the cut leaves from turning brown.
El regular pinching During the growing season it helps maintain compact foliage and encourages secondary branching, key to the final aesthetics of the bonsai.
Shaping pruning: shaping the bonsai
La shaping pruning It involves selectively removing branches to define the tree's shape. This is especially important in the early stages or when you want to radically change its silhouette. These cuts are usually more drastic and should be made when the tree is strong, preferably in spring or late fall.
It can be complemented with wiring To guide young branches and improve the shape. After removing thick branches, it is recommended to apply sealing paste to facilitate healing and prevent infection.
Root pruning: the secret of miniaturization
The balance between roots and crown is vital in bonsai cultivation. During the transplant (normally every two years in young trees or every three or four in adult specimens), the root pruning:
- Remove long, tangled roots or those surrounding the root ball.
- It preserves the fine, fibrous roots, which absorb most of the water and nutrients.
- Ensure that the volume of roots removed does not exceed one-third to avoid excessive shock.
Proper root pruning helps maintain a healthy balance and prepares the tree for a new growth cycle.
Post-pruning care: watering, fertilizing, and protection
After pruning, the tree needs special care to recover:
- Irrigation: Slightly increase the frequency and water gently, without flooding, to promote recovery.
- Fertilization: Use balanced fertilizers, preferably slow-release, to facilitate tissue regeneration.
- Protection against pests and fungi: After pruning, the bonsai may be more vulnerable. Inspect it regularly and respond quickly to any symptoms.
- Sealing paste: Cover larger cuts to prevent the entry of pathogens.
A well-cared-for bonsai after pruning will show improvement in its appearance, branching, and overall health.
Common mistakes and how to avoid them
Many beginners make common mistakes that can damage their bonsai. Here we highlight them and suggest ways to avoid them:
- Overpruning: Removing too many branches at once weakens the tree. It's better to prune lightly and frequently.
- Pruning in inappropriate seasons: Winter and summer should be avoided, unless the species tolerates it or the tree is in optimal condition.
- Using inappropriate tools: Dull, rusty, or garden shears can cause irreparable damage and infections.
- Poor planning: Not studying the design before cutting can ruin years of work.
Practical tips for beginners
- First step: observation: Take time to analyze the tree from different angles to decide on the design.
- Make clean, angled cuts: This facilitates healing and prevents open wounds.
- Perform progressive pruning: It is better to correct little by little than to make excessive cuts at once.
- Practice with patience: skill is acquired with time and dedication.
Advanced techniques: defoliation and fencing
For those with experience, the defoliated Partial or total pruning of healthy, vigorous trees, especially deciduous species, can promote smaller leaves and additional branching. This technique is performed in summer by removing leaves to stimulate new shoots. In addition, wiring It allows you to direct young branches and perfect the design of the tree, always taking care not to damage the bark.
When to transplant and its relationship with pruning
Transplantation and the root pruning They are complementary processes. Take advantage of this operation to check and renew the substrate and roots, ensuring balanced development of the canopy and root system, preferably in spring every two or three years.
Mastering bonsai pruning requires practice, perseverance, and careful observation. By paying attention to the techniques, timing, and care specific to each species, you'll achieve healthy, beautiful, and unique trees. Each cut represents an opportunity to improve the health and aesthetics of your bonsai, and taking steps forward is the key to achieving this.