soil compaction poor drainage on Bonsai
Quick answer
If your Bonsai has soil compaction poor drainage, the most likely cause is: Bonsai soil must retain moisture while allowing excess water to drain and air to reach roots. Dense, waterlogged soil suffocates roots; too freely draining soil dries too quickly. Standard garden soil lacks the drainage and aeration bonsai require.
Start here:
- 1. 1. Mixture 1 (Standard): 1 part loam + 2 parts sphagnum moss peat + 2 parts granite grit — suits most bonsai species
- 2. 2. Mixture 2 (Free-draining): 1 part loam + 1 part peat + 3 parts grit — ideal for woodland trees and pines
Why Bonsai gets soil compaction poor drainage
Bonsai soil must retain moisture while allowing excess water to drain and air to reach roots. Dense, waterlogged soil suffocates roots; too freely draining soil dries too quickly. Standard garden soil lacks the drainage and aeration bonsai require.
How to reverse soil compaction poor drainage on Bonsai
- 1
1. Mixture 1 (Standard): 1 part loam + 2 parts sphagnum moss peat + 2 parts granite grit — suits most bonsai species
- 2
2. Mixture 2 (Free-draining): 1 part loam + 1 part peat + 3 parts grit — ideal for woodland trees and pines
- 3
3. Mixture 3 (Acidic): 1 part loam + 3 parts peat + 1 part grit — for lime-hating species like azaleas
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4. Mix all ingredients dry, pass through 5mm sieve to remove fine particles that cause compaction
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5. Never add fertilizer to initial repotting compost — wait until active growth resumes in spring
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6. Top-dress surface with 3mm pea-shingle to retain moisture and prevent summer overheating of roots
Keep soil compaction poor drainage off this Bonsai
Always use purpose-made bonsai compost — never standard potting mix. Replace soil every 2-3 years during repotting to prevent compaction.