Assess Light, Humidity, and Temperature
30 minutesMeasure ambient humidity and light hours; identify best window or supplemental lighting location.
Beginnerongoing
Indoor Bonsai Care Guide
Complete guide for indoor bonsai care — step-by-step workflow, tools, checklist, and expert tips to get started.
apartment growersoffice plant keepers
Workflow
Set Up Humidity Trays and Grouping
1 hourSize humidity trays with gravel and water below pot base; group trees to share microclimate.
Install and Position Grow Lights
1 hourMount full-spectrum LED at calculated height; set 12–16 h photoperiod timer.
Establish Watering and Fertilizing Routine
ongoingWater when topsoil dries; fertilize at half strength during growing season only.
Tools Used
- Humidity Tray SizingPrimary
Calculate humidity tray dimensions to raise ambient moisture around indoor bonsai.
- Grow Light Height CalculatorPrimary
Determine optimal LED grow light distance from canopy to prevent burn and ensure adequate PAR.
- Watering Schedule EstimatorSupporting
Set watering frequency based on pot size, soil mix, and indoor humidity levels.
- Fertilizer Dilution RatioReference
Dilute fertilizer to half strength for containerized indoor trees.
Checklist
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Environment
Safety
Care
Maintenance
Reference Materials
Indoor Species RequirementsTable
Light and humidity needs for common indoor bonsai.
| Species | Light Hours | Humidity % | Min Temp (°C) |
|---|---|---|---|
| Ficus | 12–16 h | 50–60 | 15 |
| Carmona (Fukien tea) | 10–14 h | 60–70 | 18 |
| Serissa | 10–14 h | 55–65 | 15 |
| Chinese elm | 10–14 h | 45–55 | 10 |
Watering TriggerFormula
Water when substrate dry 1 cm below surface — frequency = f(pot volume, humidity, season).
Humidity Tray RuleStandard
Tray water level must stay below pot drainage holes — evaporation, not absorption, raises humidity.
Outdoor Summer Holiday
Move indoor trees outside in summer shade — one season outdoors dramatically improves vigor.
Yellow Leaves
Sudden leaf drop usually means overwatering, draft, or light change — diagnose before treating.
Electrical Safety
Grow lights and humidity trays near water require GFCI outlets — extension cords in wet areas are hazardous.
Safety Notes
- Keep grow light electrical connections away from humidity tray splash zone.
- Use horticultural-grade fertilizers at labeled dilution — household chemicals kill bonsai.