CARE GUIDE

The Art of Keeping

Species-specific guidance for every tree in the collection. A living bonsai is a lifelong conversation between artist and tree — these notes are where that conversation begins.

Juniper

Outdoor · Hardy
杜松 · Juniperus spp.

The most widely grown bonsai species in the world. Junipers reward patience and punishment equally — they thrive on neglect more than fuss, but need outdoor exposure year-round.

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Light

Full sun outdoors, minimum 4–6 hours direct light daily. Never keep indoors permanently — junipers die slowly without UV and airflow. In summer, light afternoon shade prevents scorching.

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Watering

Water thoroughly when the top 1cm of soil begins to dry. Allow the soil to approach dryness between waterings — junipers hate sitting wet. In summer, this may mean daily watering. In winter, reduce dramatically.

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Temperature

Hardy to −15°C. Needs a proper winter dormancy period. Protect from frost below −10°C in a cold greenhouse or unheated shed — never bring fully indoors. Frost hardens the wood and is essential.

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Pruning

Pinch back new growth throughout the growing season (spring–autumn). Never cut into bare wood — junipers do not back-bud from leafless branches. Remove all upward-pointing shoots to maintain the cascade or spreading form.

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Repotting

Every 2–3 years in early spring before buds break. Use a free-draining mix (60% akadama, 40% pumice). Avoid root disturbance in summer or autumn.

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Feeding

Balanced fertiliser (NPK 6-6-6) every 2–3 weeks from spring through mid-autumn. Switch to low-nitrogen (0-10-10) in late summer to harden growth before winter.

⚠ WATCH FOR

Spider mites in hot dry conditions — look for bronzing foliage. Scale insects on older bark. Root rot if overwatered in winter.

Japanese Maple

Outdoor · Seasonal
· Acer palmatum

Among the most beautiful of all deciduous bonsai. The Japanese maple offers four distinct seasons — spring pink, summer green, autumn fire, winter structure. Each is worth watching.

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Light

Morning sun with afternoon shade. Harsh afternoon sun scorches the delicate leaves. A dappled light position is ideal — bright but not baked. In spring and autumn, more sun is welcomed.

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Watering

Keep consistently moist during the growing season. Maples dislike both drought and waterlogging. Water in the morning; wet roots overnight in summer promotes root disease. Mist leaves in hot weather.

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Temperature

Hardy to −10°C, but root systems in small pots are vulnerable. Below −5°C, protect the pot (not the tree) from freezing solid. The tree itself welcomes cold and needs full dormancy in winter.

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Pruning

Prune in late autumn after leaves drop, or in midsummer during the brief hardening pause. Maples bleed sap freely in spring — avoid pruning then. Leaf pruning (defoliation) in early summer promotes smaller leaves and ramification.

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Repotting

Every 1–2 years for young trees, every 3 years for mature specimens. Repot in early spring as buds begin to swell. Use moisture-retentive mix (70% akadama, 30% pumice). Do not bare-root — leave a mass of fine roots intact.

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Feeding

High nitrogen feed in spring to push leaf size. Balanced feed through summer. Phosphorus-rich feed in late summer to mature the wood. Stop feeding 6 weeks before expected first frost.

⚠ WATCH FOR

Aphids on new spring growth — wash off with water. Verticillium wilt — sudden branch die-back with no clear cause. Ensure good airflow to prevent fungal issues in wet conditions.

Japanese Black Pine

Outdoor · Advanced
黒松 · Pinus thunbergii

The king of bonsai species. Black Pine is demanding, slow-rewarding, and utterly magnificent when mastered. The annual "candle work" cycle defines the art form for many practitioners.

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Light

Full sun, all day, every day. Black Pine demands more light than almost any other bonsai species. Shade produces weak, long needles and poor back-budding. South-facing positions are ideal.

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Watering

Water thoroughly, then allow soil to partially dry before watering again. Pines tolerate dry conditions far better than wet. Reduce watering in winter — dormant pines need minimal moisture. Never let the pot sit in water.

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Temperature

Hardy to −15°C. Needs outdoor conditions year-round. Cold dormancy is essential — a winter without cold produces weak, etiolated spring growth. Protect only in extreme sustained frost below −15°C.

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Pruning

Candle work is the core technique: in spring, remove or cut back extending candles before needles open to control vigour. In autumn (August–October), remove the summer's needles from strong areas to stimulate back-budding and balance energy across the tree.

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Repotting

Every 3–5 years for mature trees, in early spring before candles extend. Use very free-draining mix (40% akadama, 60% pumice/lava). Pines form mycorrhizal associations — always retain some old soil when repotting.

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Feeding

Heavy feeder. Balanced high-nitrogen feed through spring. Reduce nitrogen after candle work. Low-nitrogen, high-phosphorus feed from late summer through autumn to mature and harden the new growth before winter.

⚠ WATCH FOR

Pine needle scale — white encrusted deposits on needles. Pine processionary moth in warmer climates. Root rot if drainage is poor. Yellowing needles in winter are normal shedding — check for patterns before worrying.

Chinese Elm

Indoor/Outdoor · Beginner
· Ulmus parvifolia

The ideal first bonsai species. Chinese Elm forgives mistakes, recovers from neglect, and rewards attention with extraordinary fine ramification. It can be grown indoors in cool climates, though it prefers outdoor summers.

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Light

Bright light — direct morning sun preferred. If grown indoors in winter, place directly in front of a south-facing window or under a grow light. Outdoors in summer, full to partial sun. Moves beautifully between environments.

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Watering

Keep consistently moist — Chinese Elm does not tolerate drought well. Check daily in summer; the fine root system dries faster than coarser species. Allow slight drying between waterings in winter if kept cool indoors.

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Temperature

Semi-evergreen in mild winters, fully deciduous in cold ones. Can be kept indoors over winter at 5–15°C. Tolerates outdoor temperatures to −5°C but benefits from frost protection. Adapts remarkably well to indoor environments.

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Pruning

Prune back to 1–2 leaves after every 4–6 leaves of new growth throughout the growing season. This constant trimming builds the fine branching structure the elm is famous for. Hard prune in early spring before leaf break.

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Repotting

Every 1–2 years for young trees. Early spring, before leaf break. Use a balanced mix (50% akadama, 25% pumice, 25% fine grit). Elms tolerate moderate root pruning well — up to one-third of root mass can be removed.

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Feeding

Feed every 2 weeks through the growing season with a balanced fertiliser. Elms are moderate feeders — overfeeding produces coarse growth and large leaves. Reduce feeding in autumn; stop in winter.

⚠ WATCH FOR

Spider mites indoors in winter (low humidity). Elm leaf miner — pale patches on leaves. Scale insects on bark. Generally robust — if leaves yellow and drop suddenly, check watering before anything else.

Fukien Tea

Indoor · Tropical
福建茶 · Carmona retusa

One of the few true indoor bonsai species. Fukien Tea thrives in the warmth and humidity of a home, producing small white flowers and red berries year-round when conditions are right.

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Light

Bright indirect light indoors — a well-lit windowsill, not direct midday sun through glass, which magnifies heat. In summer, outdoor placement in partial shade is beneficial. Needs minimum 4 hours of good light daily to flower.

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Watering

Keep moderately moist — never waterlogged, never fully dry. Fukien Tea is sensitive to both extremes. Water with room-temperature water; cold tap water can shock tropical roots. Mist the foliage regularly to maintain humidity.

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Temperature

Keep above 15°C at all times — this is a tropical species that cannot tolerate frost or cold draughts. Ideal range: 18–28°C. Avoid placing near radiators (too dry) or air conditioning vents (too cold and dry). Stable warmth is key.

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Pruning

Prune back new shoots to 2–3 leaves throughout the year. Fukien Tea grows year-round indoors and benefits from regular light trimming rather than infrequent hard pruning. Remove spent flowers and berries to encourage new flowering cycles.

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Repotting

Every 2–3 years in late spring or early summer. Use a well-draining tropical mix (50% akadama, 30% perlite, 20% organic matter). Keep warm after repotting — cold shock after root disturbance causes leaf drop.

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Feeding

Balanced liquid fertiliser every 2 weeks in spring and summer. Monthly in autumn and winter — Fukien Tea continues growing slowly year-round indoors and still needs nutrients. Switch to a flowering formula when buds appear.

⚠ WATCH FOR

Spider mites and whitefly in dry indoor air — maintain humidity. Leaf drop after moving the tree is normal adjustment, not death. Yellow leaves usually mean overwatering or cold roots.

Black Pine Literati

Outdoor · Artistic
黒松 文人木 · Pinus thunbergii (Bunjin-gi)

The literati form is philosophy made visible — a tree that has survived against all odds, stripped of everything but its essential spirit. Care follows the same principles as Black Pine, with special attention to the dramatic, sparse silhouette.

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Light

Full unobstructed sun is essential. The spare foliage of literati style means every needle must work hard — insufficient light causes the remaining foliage pads to weaken. Do not compromise on light placement.

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Watering

Water thoroughly but infrequently. The literati aesthetic often uses tall narrow pots with excellent drainage — water passes through quickly. Check soil moisture at root depth, not just surface. Drought-tolerant once established.

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Temperature

Hardy to −15°C. Full outdoor exposure year-round. The windswept character of the literati form is shaped by exposure — shelter from wind and cold produces trees that look domesticated, not ancient.

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Pruning

Restraint is the art. Remove shoots that break the silhouette, but resist the urge to fill in negative space — the gaps are the design. Annual candle work as per standard Black Pine. Dead wood (jin/shari) is a feature, not a flaw — treat with lime sulphur to preserve and bleach.

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Repotting

Every 4–6 years — literati pines are often older, slower-growing specimens that resent frequent root disturbance. Spring only, before candles extend. Retain maximum mycorrhizal soil. Prioritise drainage above all else.

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Feeding

Feed conservatively — over-vigorous growth breaks the refined silhouette. Moderate balanced feed in spring, reduced thereafter. The goal is slow, compact development, not explosive growth.

⚠ WATCH FOR

Same as Black Pine: needle scale, processionary moth. Check that dead wood features (jin/shari) are not progressing into live tissue. Inspect for resin flow at pruning cuts.

SEASONAL CALENDAR

Bonsai work follows the rhythm of the seasons. This calendar applies to outdoor hardy species in a temperate European climate (Zurich zone).

春 Spring
Mar – May
  • Repot deciduous species as buds swell
  • Begin regular feeding with high-nitrogen fertiliser
  • Watch for spring pests — aphids on new growth
  • Pinch pine candles before needles open
  • Start daily watering as temperatures rise
夏 Summer
Jun – Aug
  • Water daily or twice daily in heat
  • Shade sensitive species (maple) from afternoon sun
  • Continue regular feeding; switch to balanced NPK
  • Light trim to maintain shape
  • Monitor for spider mites in hot dry conditions
秋 Autumn
Sep – Nov
  • Switch to low-nitrogen, high-phosphorus feed
  • Needle work on black pine (August–October)
  • Prune deciduous species after leaf drop
  • Reduce watering frequency as temperatures cool
  • Begin frost protection planning
冬 Winter
Dec – Feb
  • Allow hardy species full cold dormancy
  • Protect pot (not tree) from sustained hard frost
  • Minimal watering — check fortnightly for outdoor trees
  • Bring tropical species indoors above 15°C
  • Plan repotting and styling for spring

Find Your Tree

Each specimen in the collection comes with personal care guidance for your specific tree and conditions.

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