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Repotting Bonsai: Time - When ? Is fertilizer used afterwards? Root pruning ?
Repot bonsai - When is the right time ?
- Bonsai soil compactation: Many bonsai soils disintegrate over time and then have to be exchanged.
- If the root mass is too large for the bonsai pot. The roots are then reduced by repotting with root pruning.
- In case of lack of oxygen in the root area. Mostly when the bonsai soil is too fine.
- Pests have accumulated in the soil. Rarely a repotting reason. Sometimes it's a possibility.
- When the soil is salinated, eg. after over-fertilisation with a mineral fertilizer (nutrient salt).
Repotting bonsai - General Information
- The best time for repotting for most plants is early spring (late February to early April). Injuries to the roots can heal quickly.
- Younger and fast growing trees are repotted every 1-2 years. With adult Bonsai (forming is essentially completed) normally a 3-5 year rhythm is sufficient.
- The bonsai can be better removed from the pot and the soil from the root ball when repotting by slightly drying (caution: do not dry out!) the root ball.
- The roots should never be allowed to dry properly during repotting. Spraying is helpful.
- Do not fertilize for 2 weeks after repotting. Only a few root hairs are intact anyway, which can absorb nutrients.
- Moderate watering of the bonsai in the weeks after repotting promotes the formation of new roots. Don't drown the tree.
- A slight shade reduces the shock during and after repotting. The risk that the bonsai suffers damage is significantly reduced.
Repotting bonsai tree - Does the bonsai need a bigger bonsai pot ?
Usually no. The size of the bonsai pot depends on the size of the bonsai. It must match the exterior of the bonsai.
If the root ball is too big for the right pot it will be reduced. The root ball of the bonsai is should fit the pot and do not select the bonsai pot suitable to the root ball. If the root ball can not be shrunk at once as needed then the bonsai actually does not belong in the final bonsai pot.