If healthy, the mini bonsai pot is filled with the roots in one to a few years. The roots need room and new soil to absorb nutrients to produce new roots. So, repotting your mini bonsai tree is crucial for its growth and well-being.
Here is what you need for repotting and how to repot your mini bonsai tree.
- What You Need For Repotting A Mini Bonsai Tree
- Repotting A Mini Bonsai Tree- Complete Step
- Step 1: Remove the tree from the old pot
- Step 2: Remove old soil from the tree’s roots
- Step 3: Prune the roots
- Step 4: Test the position of the tree in the new pot
- Step 5: Place a pot bottom net in the new pot
- Step 6: Put some of the bonsai soil mix
- Step 7: Reposition the tree and spread the roots evenly
- Step 8: Put the rest of the bonsai soil mix
- Step 9: Secure the tree using wires/strings
- Step 10: Water the tree
- Step 11: Avoid strong wind and direct sunlight
What You Need For Repotting A Mini Bonsai Tree
To repot a mini bonsai tree you need;
- new bonsai soil mix
- a pot bottom net
- a new pot
- wooden chopsticks
- sharp scissors
Repotting A Mini Bonsai Tree- Complete Step
Step 1: Remove the tree from the old pot
If the roots are pot-bound;
- tap the rim of the pot several times and see if you can remove the tree from the pot;
- secure the tree, turn the pot upside down and gently tap the rim of the pot against a wall/ wooden shelf; or,
- use a small wooden spatula to gently make vertical cuts alongside the pot. Grab the bottom of the trunk and tease it very gently until you can remove the tree from the pot.
Step 2: Remove old soil from the tree’s roots
Using a wooden chopstick, remove 1/3 of the old soil from the tree’s roots so that you can observe the root system clearly.
Step 3: Prune the roots
Observe the root system and using sharp scissors, cut;
- roots that are especially thicker than other roots so that all the roots will be approximately the same thickness;
- roots that disturb other roots when they are spread in all directions (to achieve good nebari);
- overgrown roots that are longer than the depth of the new pot; and,
- dead roots.
Step 4: Test the position of the tree in the new pot
- Decide the front of the tree and that of the pot.
- Put the tree in the new pot to test if its position is balanced.
- The tree can be positioned in either the center or towards the edge of the pot.
Step 5: Place a pot bottom net in the new pot
Place a pot bottom net in the new pot to cover the drainage hole(s). If the mesh of the net is too large for the new soil, you can use the fine-mesh screen used in the screen door.
Step 6: Put some of the bonsai soil mix
Put some of the new bonsai soil mix to lightly cover the base of the pot.
If the pot is relatively large as a mini bonsai pot, you can put a thin layer of bigger size akadama/ river sand in the base of the pot.
Step 7: Reposition the tree and spread the roots evenly
- Carefully place the tree in the new pot.
- Keep in mind that the front of the tree and the pot is in the position decided in the previous step.
- Spread the roots evenly in every direction so that good surface roots (nebari) are developed.
Step 8: Put the rest of the bonsai soil mix
- Hold the tree in place and put the rest of the bonsai soil mix in the pot.
- Use a wooden chopstick to gently push the soil into the air pockets.
- Add more soil and push the soil in between the roots.
- Repeat the process until all the gaps are filled and the soil is at the level just below the rim of the pot.
Step 9: Secure the tree using wires/strings
Secure the tree to the pot using wires/strings. The roots of the tree should be locked and immovable in the soil until the new roots are regenerated vigorously.
Step 10: Water the tree
Water the tree by immersion method. This method allows you to completely moisturize the dry soil.
For details about the immersion method of watering, please refer to the following post.
The ultimate guide to watering your mini bonsai (link here)
Step 11: Avoid strong wind and direct sunlight
Do not let the new soil to dry out and avoid strong wind as well as direct sunlight for a week after repotting. Maintenance and care during this period are the keys to a successful repotting.