soil mix drainage on Bonsai
Quick answer
If your Bonsai has soil mix drainage, the most likely cause is: Standard garden soil compacts in bonsai containers, destroying the air channels roots need for gas exchange and leading to root suffocation and rot.
Start here:
- 1. 1. Use a mix of 3+ components: lava rock (or akadama) for drainage, pumice for water retention, and pine bark (or organic compost) for nutrients
- 2. 2. Example mix: 1 part akadama, 1 part pumice, 1 part lava rock, 1/2 part organic matter
Why Bonsai gets soil mix drainage
Standard garden soil compacts in bonsai containers, destroying the air channels roots need for gas exchange and leading to root suffocation and rot.
How to reverse soil mix drainage on Bonsai
- 1
1. Use a mix of 3+ components: lava rock (or akadama) for drainage, pumice for water retention, and pine bark (or organic compost) for nutrients
- 2
2. Example mix: 1 part akadama, 1 part pumice, 1 part lava rock, 1/2 part organic matter
- 3
3. Mark Patterson's proven mix: lava rock, sea sand, granite #2, and pine bark in equal proportions
- 4
4. Add coarse-grained soil as the foundation layer at the bottom of the pot for stability and drainage
- 5
5. Use mesh screens over drainage holes to prevent soil erosion while allowing water to escape
- 6
6. Repot with fresh mix every 1-3 years depending on tree age — younger trees need more frequent repotting
Keep soil mix drainage off this Bonsai
Use a free-draining bonsai soil mix with at least 3 components: one granular amendment for drainage, one for water retention, and one organic component for nutrient availability. Never use garden soil alone.