Determine Repotting Window by Species
30 minutesRepot deciduous before bud break; conifers during candle extension; tropicals in warm months.
Intermediate1-2 days
Bonsai Repotting Season Guide
Complete guide for bonsai repotting season — step-by-step workflow, tools, checklist, and expert tips to get started.
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Workflow
Prepare Soil, Pot, and Tools
1 hourMix fresh substrate; select next pot size if upgrading; sharpen root scissors and wire.
Remove Tree, Comb Roots, and Prune
1-2 hours per treeCut ⅓ root mass; remove circling roots; create flat pad on bottom for pot contact.
Repot, Water, and Shade for Recovery
30 minutesPosition tree, fill soil with chopstick tamping, water until runoff clear; shade 2–4 weeks.
Tools Used
- Root Pruning IntervalPrimary
Determine whether tree is due for repotting based on species, age, and last repot date.
- Soil Mix RatioPrimary
Prepare fresh substrate mix at correct ratio for the species being repotted.
- Bonsai Pot Size CalculatorSupporting
Decide whether to upsize pot or return to same container after root pruning.
- Watering Schedule EstimatorReference
Adjust watering frequency during post-repot recovery period.
Checklist
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Planning
Quality
Preparation
Execution
Aftercare
Reference Materials
Repotting Intervals by SpeciesTable
Typical years between repotting.
| Species Type | Young Tree | Mature Tree | Best Season |
|---|---|---|---|
| Deciduous | 2 years | 3–5 years | Early spring |
| Conifer | 3 years | 5–7 years | Spring candles |
| Tropical | 1–2 years | 2–3 years | Warm months |
| Collected yamadori | 3–5 years | 5–10 years | After recovery |
Root Pruning LimitFormula
Maximum root removal = ⅓ total root mass per repot — exceeding this risks tree death.
Soil TampingStandard
Fill soil in layers, tamping with chopstick to eliminate air pockets — voids cause root death.
Batch Repot
Repot entire collection in one season window — setup time is the biggest efficiency loss.
Chopstick Test
Soil is properly tamped when chopstick meets resistance throughout — not just at surface.
Tool Sterilization
Dip root scissors in alcohol between trees to prevent pathogen spread.
Safety Notes
- Root pruning tools are sharp — cut away from body and keep fingers clear of scissor blades.
- Dispose of old soil away from collection — it may harbor pests and pathogens.