13 phases · 36 species · 2328 seasonal notes · Pacific Northwest, Zone 8b
The Calendar
Bonsai keeps a different calendar — thirteen phases instead of twelve months, read from buds and weather instead of dates. Turn the wheel to any season; every species answers.
Happening now · day 8 of 41 · Late Summer in 34 days
Mid Summer
The garden is holding its breath in the heat. Water deeply, feed lightly, and let the trees rest. Structural work waits for autumn.
208 notes across 28 species this phase
Watering
28 speciesBoxwood11 on the bench
Keep consistently moist but not soggy.
Japanese Maple 'Sharp's Pygmy'6 on the bench
Monitor daily; ensure no drought stress.
Dawn Redwood5 on the bench
Daily watering often needed; monitor closely during heat waves.
Chinese Juniper3 on the bench
High-frequency watering; early morning preferred.
Colorado Blue Spruce2 on the bench
Maintain frequent watering. Avoid wet feet by ensuring proper drainage.
Coralbark Japanese Maple2 on the bench
Monitor daily; ensure no drought stress.
Bigleaf Maple1 on the bench
Monitor daily; ensure no drought stress.
Canyon Live Oak1 on the bench
Monitor daily. Use chopstick method to gauge soil. Provide humidity trays if needed.
Copper Beech1 on the bench
High frequency; check twice daily in heat.
Creeping Juniper1 on the bench
Watch closely—shallow pots dry fast in heat.
Engelmann Spruce1 on the bench
High demand; water thoroughly and consistently.
Ginkgo biloba1 on the bench
High frequency watering, especially during heatwaves.
Hall's Crabapple1 on the bench
Multiple times a day during heatwaves.
Himalayan Juniper1 on the bench
Increase frequency in heat. Early morning watering preferred.
Japanese Larch1 on the bench
Daily or as needed; larch hates drying out.
Japanese Maple 'Bloodgood'1 on the bench
Monitor daily; ensure no drought stress.
Japanese Yew1 on the bench
High heat requires consistent moisture. Mulch surface if needed.
Lilac Sensation1 on the bench
High demand. Maintain soil moisture.
Procumbens Juniper Nana1 on the bench
High frequency; don’t let pot dry out. Morning watering preferred.
Satsuki Azalea1 on the bench
High water demand. Water early and late in the day if hot.
Trident Maple1 on the bench
High-frequency watering; ensure no stress during heat.
From the wider reference
Monitor twice daily. Do not let dry.
Essential to monitor moisture daily. Water in early morning or evening.
Slightly reduce watering if temperatures exceed 90°F.
Maintain regular watering; soil evenly moist.
European Smoketree, AKA Venetian Sumach
Daily or twice daily during heat waves.
Water consistently; avoid drought conditions.
Daily or more in extreme heat; monitor container dryness.
Feeding
28 speciesBoxwood11 on the bench
Reduce nitrogen; use lower nitrogen fertilizer.
Japanese Maple 'Sharp's Pygmy'6 on the bench
Taper nitrogen; hold feed during hottest weeks.
Dawn Redwood5 on the bench
Continue biweekly feeding with low-nitrogen fertilizer.
Chinese Juniper3 on the bench
Continue nitrogen-based feeding if pushing growth.
Colorado Blue Spruce2 on the bench
Resume light feeding if growth has slowed naturally.
Coralbark Japanese Maple2 on the bench
Taper nitrogen; hold feed during hottest weeks.
Bigleaf Maple1 on the bench
Taper nitrogen; hold feed during hottest weeks.
Canyon Live Oak1 on the bench
Withhold fertilizer during heat waves to avoid root burn.
Copper Beech1 on the bench
Pause or reduce depending on vigor.
Creeping Juniper1 on the bench
Pause if growth stalls in heat.
Engelmann Spruce1 on the bench
Discontinue high nitrogen; switch to low or zero nitrogen.
Ginkgo biloba1 on the bench
Light feeding only; avoid stimulating excessive growth.
Hall's Crabapple1 on the bench
Reduce frequency if growth slows.
Himalayan Juniper1 on the bench
Stop fertilizing in peak heat to avoid stressing roots.
Japanese Larch1 on the bench
Light feeding with low nitrogen.
Japanese Maple 'Bloodgood'1 on the bench
Taper nitrogen; hold feed during hottest weeks.
Japanese Yew1 on the bench
One final low-nitrogen feed can be given early.
Lilac Sensation1 on the bench
Continue monthly with organic or slow-release.
Procumbens Juniper Nana1 on the bench
Suspend or use weak feed to avoid burning roots.
Satsuki Azalea1 on the bench
Continue feeding every 2-3 weeks. Use dilute liquid feed.
Trident Maple1 on the bench
Reduce nitrogen, focus on potassium if flower/fruit desired.
From the wider reference
Switch to lower nitrogen mix to harden growth.
Reduce nitrogen. Use lower-N, higher-P/K fertilizer to support flowers and fruit.
Use diluted fertilizer monthly during peak heat.
Reduce nitrogen; apply low-nitrogen fertilizer.
European Smoketree, AKA Venetian Sumach
Use low-nitrogen or potassium-rich feed to support wood maturity.
Reduce nitrogen; emphasize potassium and phosphorus.
Continue light feeding; avoid nitrogen-heavy fertilizers.
Repotting
2 speciesPruning
24 speciesBoxwood11 on the bench
Minimal; avoid heavy pruning.
Japanese Maple 'Sharp's Pygmy'6 on the bench
Pinch back soft spring growth; wait until fall for structure.
Dawn Redwood5 on the bench
Minimal pruning; avoid stress during high heat.
Chinese Juniper3 on the bench
Avoid heavy cuts; tip pruning only.
Coralbark Japanese Maple2 on the bench
Pinch back soft spring growth; wait until fall for structure.
Bigleaf Maple1 on the bench
Pinch back soft spring growth; wait until fall for structure.
Canyon Live Oak1 on the bench
Minimal pruning; allow energy storage. Maintain form if needed.
Creeping Juniper1 on the bench
Very light touch-ups only.
Hall's Crabapple1 on the bench
Only minor trimming; avoid heavy stress.
Himalayan Juniper1 on the bench
No structural pruning. Only minimal cleanup of browning tips.
Japanese Larch1 on the bench
Only tip pruning if needed.
Japanese Maple 'Bloodgood'1 on the bench
Pinch back soft spring growth; wait until fall for structure.
Japanese Yew1 on the bench
Minimal intervention. Focus on health.
Lilac Sensation1 on the bench
Light trimming to encourage branching.
Procumbens Juniper Nana1 on the bench
Minimal—only remove excess shoots or suckers.
Satsuki Azalea1 on the bench
Only light pruning to maintain shape.
Trident Maple1 on the bench
Pinch new growth; wait until fall for structural changes.
From the wider reference
Only minor adjustments or shoot pinching.
Light touch. Avoid heavy pruning which may trigger weak late growth.
Only light trimming; avoid major work.
Limited pruning; minor trimming for form.
European Smoketree, AKA Venetian Sumach
Avoid heavy pruning; light shaping only.
Minimal pruning; avoid stressing tree in heat.
Minor tip trimming only.
Wiring
12 speciesBoxwood11 on the bench
Monitor wires carefully to prevent scars.
Dawn Redwood5 on the bench
Remove or adjust wire to prevent scarring.
Chinese Juniper3 on the bench
Inspect for wire bite, remove or adjust if needed.
Canyon Live Oak1 on the bench
Remove wires that have started to bite. Do not apply new wiring.
Creeping Juniper1 on the bench
Monitor existing wire for bite, especially on fast growers.
Hall's Crabapple1 on the bench
Only clip-and-grow; avoid wire burns.
Himalayan Juniper1 on the bench
Remove wire that’s biting. Avoid new applications.
Japanese Larch1 on the bench
Avoid—branches are brittle under heat stress.
Procumbens Juniper Nana1 on the bench
Avoid unless necessary; high sap pressure increases breakage risk.
From the wider reference
Check wiring closely; remove if needed.
European Smoketree, AKA Venetian Sumach
Adjust or remove wires if swelling occurs.
Remove wires if biting in; bark can scar easily now.
Defoliation
3 speciesCopper Beech1 on the bench
Not recommended.
From the wider reference
Avoid full defoliation due to stress.
European Smoketree, AKA Venetian Sumach
Avoid—stress and heat reduce recovery capacity.
Buds & shoots
11 speciesDawn Redwood5 on the bench
Light trimming of coarse growth to preserve silhouette.
Chinese Juniper3 on the bench
Manage sun exposure for internal buds.
Canyon Live Oak1 on the bench
Let tree rest. Avoid forcing new growth.
Creeping Juniper1 on the bench
Remove overextended shoots or reversions.
Hall's Crabapple1 on the bench
Manage strong apex shoots.
Himalayan Juniper1 on the bench
Minimal activity; foliage may be static in heat.
Japanese Larch1 on the bench
Allow buds to rest.
Procumbens Juniper Nana1 on the bench
Trim long runners only if health allows.
Satsuki Azalea1 on the bench
Disbud excessively long shoots.
From the wider reference
European Smoketree, AKA Venetian Sumach
Use pruning to redirect energy subtly.
Stop active shoot management.
Pests & disease
28 speciesBoxwood11 on the bench
Monitor closely for pests; treat proactively.
Japanese Maple 'Sharp's Pygmy'6 on the bench
Check for powdery mildew in humid weather.
Dawn Redwood5 on the bench
Watch for fungal infections, mites, and leaf scorch.
Chinese Juniper3 on the bench
Aphids, mites, fungal spots common—treat proactively.
Colorado Blue Spruce2 on the bench
High risk period for spider mites; spray with water regularly to deter.
Coralbark Japanese Maple2 on the bench
Check for powdery mildew in humid weather.
Bigleaf Maple1 on the bench
Check for powdery mildew in humid weather.
Canyon Live Oak1 on the bench
Watch for fungal leaf spot from overhead watering. Increase airflow.
Copper Beech1 on the bench
High fungal pressure—monitor closely.
Creeping Juniper1 on the bench
High risk for spider mites—hose foliage gently to deter.
Engelmann Spruce1 on the bench
Watch for spider mites in hot weather; inspect needles.
Ginkgo biloba1 on the bench
Watch for spider mites in dry conditions.
Hall's Crabapple1 on the bench
Fire blight and scale may appear—act quickly.
Himalayan Juniper1 on the bench
High risk for mites and fungal leaf blight. Treat proactively.
Japanese Larch1 on the bench
High risk of spider mites and mildew.
Japanese Maple 'Bloodgood'1 on the bench
Check for powdery mildew in humid weather.
Japanese Yew1 on the bench
Watch for root rot and mites in heat.
Lilac Sensation1 on the bench
Continue mildew and pest monitoring.
Procumbens Juniper Nana1 on the bench
Peak pest season—use systemic treatment only if needed.
Satsuki Azalea1 on the bench
Control mildew and lace bugs. Watch leaf undersides.
Trident Maple1 on the bench
Spider mites can appear—use horticultural oil or insecticidal soap.
From the wider reference
High vigilance for mites and mildew.
Continue regular checks. Consider neem oil as preventive if pest cycles persist.
Monitor for pests in humid conditions.
Watch for fungal issues; maintain airflow.
European Smoketree, AKA Venetian Sumach
Watch for mites, mildew, and leaf scorch.
Check for fungal diseases; treat promptly.
Red spider mites and fungal blight common—treat promptly.
Summer protection
28 speciesBoxwood11 on the bench
Protect from intense sun to avoid leaf scorch.
Japanese Maple 'Sharp's Pygmy'6 on the bench
Ensure root ball doesn’t overheat—shade or pot insulation.
Dawn Redwood5 on the bench
Provide mid-day shade and wind protection.
Chinese Juniper3 on the bench
Essential; shade cloth or dappled sun recommended.
Colorado Blue Spruce2 on the bench
Maintain shade and wind protection.
Coralbark Japanese Maple2 on the bench
Ensure root ball doesn’t overheat—shade or pot insulation.
Bigleaf Maple1 on the bench
Ensure root ball doesn’t overheat—shade or pot insulation.
Canyon Live Oak1 on the bench
Maintain shade. Watch for sun scorch on older leaves.
Copper Beech1 on the bench
Critical—sun scorch is a major risk.
Creeping Juniper1 on the bench
Increase humidity around pot and use mulch or moss cover.
Engelmann Spruce1 on the bench
Protect from peak heat; humidity trays help indoors.
Ginkgo biloba1 on the bench
Provide shade during extreme heat or intense sun.
Hall's Crabapple1 on the bench
Maintain airflow and shading.
Himalayan Juniper1 on the bench
Shade cloth or dappled sun is ideal in extreme temps.
Japanese Larch1 on the bench
Shade netting advisable.
Japanese Maple 'Bloodgood'1 on the bench
Ensure root ball doesn’t overheat—shade or pot insulation.
Japanese Yew1 on the bench
Shade and airflow essential.
Lilac Sensation1 on the bench
Use shade cloth or dappled shade.
Procumbens Juniper Nana1 on the bench
Critical—shade, wind protection, and airflow required.
Satsuki Azalea1 on the bench
Maintain strong airflow and filtered sun.
Trident Maple1 on the bench
Shield roots from extreme heat if uninsulated pot.
From the wider reference
Essential. Avoid leaf scorch with shading.
Ensure afternoon shade. Mist foliage during dry spells to reduce stress.
Provide shade during prolonged heatwaves (>90°F), but otherwise full sun is ideal. Watch for heat stress, use shade cloth if needed.
Shade required during peak sun intensity.
European Smoketree, AKA Venetian Sumach
Maintain shade and consistent moisture.
Protect from intense sun.
Maintain shade during peak heat hours.
Wound care
7 speciesColorado Blue Spruce2 on the bench
Seal fresh cuts to prevent sap loss and desiccation.
Canyon Live Oak1 on the bench
Only minor cleaning of callus areas.
Creeping Juniper1 on the bench
Don’t prune heavily in high heat.
Japanese Larch1 on the bench
Do not create wounds in extreme heat.
Procumbens Juniper Nana1 on the bench
Delay major work.
From the wider reference
European Smoketree, AKA Venetian Sumach
Delay major work; focus on healing conditions.
Do not cut unless essential.
Deadwood & jin
6 speciesColorado Blue Spruce2 on the bench
Continue as needed but avoid carving during extreme heat.
Creeping Juniper1 on the bench
Only in shaded, cooled conditions.
Japanese Larch1 on the bench
Delay until cooler months.
Procumbens Juniper Nana1 on the bench
Avoid unless shaded and humid—heat stresses wood and tools.
From the wider reference
European Smoketree, AKA Venetian Sumach
Avoid due to high sap activity.
Avoid—wood dries too fast and tools can slip.
Propagation
10 speciesChinese Juniper3 on the bench
Try semi-hardwood cuttings with rooting hormone.
Canyon Live Oak1 on the bench
Continue air layering if started earlier.
Creeping Juniper1 on the bench
Difficult but possible with mist bench.
Hall's Crabapple1 on the bench
Semi-hardwood cuttings can be taken.
Himalayan Juniper1 on the bench
Take semi-hardwood cuttings if necessary, root with auxins.
Japanese Larch1 on the bench
Attempt layering.
Japanese Yew1 on the bench
Continue softwood or semi-ripe cuttings.
Satsuki Azalea1 on the bench
Continue soft/semi-hardwood propagation.
From the wider reference
European Smoketree, AKA Venetian Sumach
Continue semi-hardwood cutting propagation.
Monitor cuttings; root development begins.
Development
15 speciesDawn Redwood5 on the bench
Observe growth habits; avoid stress.
Chinese Juniper3 on the bench
Allow vigor to store energy for fall.
Canyon Live Oak1 on the bench
Rest phase. Maintain health.
Creeping Juniper1 on the bench
Hold; avoid major shaping in heat.
Ginkgo biloba1 on the bench
Minimal training; focus on health and hydration.
Hall's Crabapple1 on the bench
Let energy rebuild after early pruning.
Himalayan Juniper1 on the bench
Monitor tree health. Maintain energy balance across branches.
Japanese Larch1 on the bench
Maintain silhouette only.
Procumbens Juniper Nana1 on the bench
Do not force growth; manage health.
Satsuki Azalea1 on the bench
Mid-point growth push. Encourage fine branching.
From the wider reference
Let growth stabilize. Avoid pushing new growth now.
Focus on maintaining health, not structural work.
Encourage free growth to build trunk and branch girth. Full sun beneficial.
European Smoketree, AKA Venetian Sumach
Focus on subtle shape control; avoid stressing the tree.
Maintain health; no major interventions.
Display
6 speciesCreeping Juniper1 on the bench
Indoor or shaded exhibition only.
Himalayan Juniper1 on the bench
Avoid showing trees in distress during heat.
Japanese Larch1 on the bench
Limit exposure; avoid hot venues.
Procumbens Juniper Nana1 on the bench
Not recommended—heat stress risk.
From the wider reference
European Smoketree, AKA Venetian Sumach
Still showy if healthy, but heat stress may affect appearance.
Not recommended.