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.

JFMAMJJASONDLate Dormancy · Feb 15 – Mar 10Early Spring · Mar 11 – Apr 15Mid Spring · Apr 16 – May 10Late Spring · May 11 – May 31Early Summer · Jun 1 – Jun 30Mid Summer · Jul 1 – Aug 10Late Summer · Aug 11 – Aug 31Early Fall · Sep 1 – Sep 30Mid Fall · Oct 1 – Oct 31Late Fall · Nov 1 – Nov 15Early Winter · Nov 16 – Dec 31Mid Winter · Jan 1 – Jan 31Late Winter · Feb 1 – Feb 14PHASE 7 OF 13Late SummerAUG 11 – AUG 31

Happening now · day 1 of 21 · Early Fall in 21 days

Late Summer

The heat loosens its grip. The trees bank energy for the season ahead.

155 notes across 28 species this phase

Watering

28 species

Boxwood11 on the bench

Gradually reduce watering frequency slightly.

Japanese Maple 'Sharp's Pygmy'6 on the bench

Maintain consistent moisture as growth slows.

Dawn Redwood5 on the bench

Maintain regular watering; reduce slightly if heat drops.

Chinese Juniper3 on the bench

Stay consistent; don't allow drying out between cycles.

Colorado Blue Spruce2 on the bench

Consistent watering schedule. Begin tapering as temperatures cool slightly.

Coralbark Japanese Maple2 on the bench

Maintain consistent moisture as growth slows.

Bigleaf Maple1 on the bench

Maintain consistent moisture as growth slows.

Canyon Live Oak1 on the bench

Adjust as temperatures begin to moderate. Avoid letting soil dry out completely.

Copper Beech1 on the bench

Slightly reduce as heat subsides.

Creeping Juniper1 on the bench

Begin reducing watering slightly if temps drop.

Engelmann Spruce1 on the bench

Reduce frequency slightly as growth slows.

Ginkgo biloba1 on the bench

Continue consistent moisture, but avoid waterlogging.

Hall's Crabapple1 on the bench

Steady, consistent watering; reduce evening water.

Himalayan Juniper1 on the bench

Adjust to cooler nights. Don’t reduce too quickly—monitor closely.

Japanese Larch1 on the bench

Adjust with rain cycles; avoid overwatering.

Japanese Maple 'Bloodgood'1 on the bench

Maintain consistent moisture as growth slows.

Japanese Yew1 on the bench

Slightly reduce watering as temps begin to drop.

Lilac Sensation1 on the bench

Reduce frequency slightly if temps fall.

Procumbens Juniper Nana1 on the bench

Maintain high vigilance; root rot possible with overwatering.

Satsuki Azalea1 on the bench

Water deeply but slightly reduce frequency as temps dip.

Trident Maple1 on the bench

Maintain consistent moisture as growth begins to slow.

From the wider reference

Canadian Hemlock

Reduce slightly if temperatures drop, but monitor carefully.

Common Pear

Maintain consistent watering. Avoid water stress as temperatures begin to dip.

Dwarf Jade

Maintain regular watering while preparing for slower growth.

European Hornbeam

Reduce watering slightly as growth slows.

European Smoketree, AKA Venetian Sumach

Maintain consistent hydration as days shorten.

Japanese Barberry

Slightly reduce watering as growth slows.

Sawara Cypress

Begin slightly reducing frequency as temps cool.

Feeding

27 species

Boxwood11 on the bench

Apply last feeding of balanced or phosphorus-rich fertilizer.

Japanese Maple 'Sharp's Pygmy'6 on the bench

Apply phosphorus high feed to support root health.

Dawn Redwood5 on the bench

Resume full-strength feeding for root building.

Chinese Juniper3 on the bench

Last round of nitrogen fertilizer mid-month.

Colorado Blue Spruce2 on the bench

Apply one last dose of low-nitrogen fertilizer before fall dormancy.

Coralbark Japanese Maple2 on the bench

Apply phosphorus high feed to support root health.

Bigleaf Maple1 on the bench

Apply phosphorus high feed to support root health.

Canyon Live Oak1 on the bench

Resume low-dose feeding if growth resumes slightly.

Copper Beech1 on the bench

Resume light feeding if growth allows.

Creeping Juniper1 on the bench

Resume light feeding if growth recommences.

Ginkgo biloba1 on the bench

Resume mild feeding if growth slows.

Hall's Crabapple1 on the bench

Resumes with balanced mix as temps cool.

Himalayan Juniper1 on the bench

Resume low-nitrogen feeding late in this window if new growth starts.

Japanese Larch1 on the bench

Resume regular balanced feeding.

Japanese Maple 'Bloodgood'1 on the bench

Apply phosphorus high feed to support root health.

Japanese Yew1 on the bench

Apply final potassium-rich fertilizer to strengthen wood.

Lilac Sensation1 on the bench

Last feeding should be low nitrogen, high potassium.

Procumbens Juniper Nana1 on the bench

Resume feeding with balanced or low-nitrogen formula.

Satsuki Azalea1 on the bench

Stop nitrogen-rich fertilizers. Shift to low-N, high-K.

Trident Maple1 on the bench

Back off nitrogen; apply phosphorus-rich formula.

From the wider reference

Canadian Hemlock

One final feeding low in nitrogen to support buds.

Common Pear

Stop nitrogen fertilization mid to late phase. Use mild PK mix if any feeding is needed.

Dwarf Jade

Final summer fertilization if needed.

European Hornbeam

Final seasonal feeding; phosphorus-rich.

European Smoketree, AKA Venetian Sumach

Final low-nitrogen feed to prepare for dormancy.

Japanese Barberry

Final phosphorus-heavy feeding.

Sawara Cypress

Last feeding with low-N fertilizer.

Repotting

1 species

Sawara Cypress

Still not advised.

Pruning

18 species

Dawn Redwood5 on the bench

Prune for refinement if growth has slowed.

Chinese Juniper3 on the bench

Light cleanup only.

Canyon Live Oak1 on the bench

Selective thinning of interior shoots to let light in.

Copper Beech1 on the bench

Light cleanup possible.

Creeping Juniper1 on the bench

Begin gentle thinning for shape correction.

Engelmann Spruce1 on the bench

Light cleanup pruning acceptable.

Ginkgo biloba1 on the bench

Light cleanup pruning if needed.

Hall's Crabapple1 on the bench

Light structural corrections; avoid shock.

Himalayan Juniper1 on the bench

Clean dead tips or unwanted growth. Avoid stress cuts.

Japanese Larch1 on the bench

Clean up weak shoots.

Lilac Sensation1 on the bench

Avoid major cuts; only tip prune if needed.

Procumbens Juniper Nana1 on the bench

Selective thinning may be done to restore airflow.

Satsuki Azalea1 on the bench

No major pruning. Allow tree to begin slowing.

From the wider reference

Canadian Hemlock

Avoid pruning. Allow buds to harden.

Common Pear

Remove water sprouts and crossing shoots. Avoid heavy cuts.

Dwarf Jade

Tidy shape, avoid heavy pruning.

European Smoketree, AKA Venetian Sumach

Light trim if needed to maintain silhouette.

Sawara Cypress

Remove weak or diseased shoots.

Wiring

10 species

Dawn Redwood5 on the bench

Last chance to wire before lignification for the year.

Chinese Juniper3 on the bench

Begin planning for fall rewiring if needed.

Creeping Juniper1 on the bench

Final chance for summer adjustments before hardening.

Engelmann Spruce1 on the bench

Can rewire if new growth has hardened off.

Hall's Crabapple1 on the bench

Start checking earlier wiring for bite.

Himalayan Juniper1 on the bench

Can begin wiring again cautiously if new growth hardens.

Japanese Larch1 on the bench

Still not advised.

Procumbens Juniper Nana1 on the bench

Check and remove wires that may be biting in.

From the wider reference

European Smoketree, AKA Venetian Sumach

Avoid new wiring; begin planning for fall/winter wiring.

Sawara Cypress

Begin considering wiring for fall shaping if temps allow.

Buds & shoots

7 species

Canyon Live Oak1 on the bench

Minor thinning to redirect energy for autumn growth.

Creeping Juniper1 on the bench

Balance shoot vigor.

Hall's Crabapple1 on the bench

Maintain silhouette and taper.

Himalayan Juniper1 on the bench

Pinch late flushes to keep pads tidy.

Japanese Larch1 on the bench

Remove excess shoots if crowding begins.

From the wider reference

European Smoketree, AKA Venetian Sumach

Let late growth mature; don’t force new flushes.

Sawara Cypress

Halt trimming—let shoots harden.

Pests & disease

18 species

Dawn Redwood5 on the bench

Clean foliage and monitor for fungal buildup.

Chinese Juniper3 on the bench

Late season fungal issues; ensure good air circulation.

Colorado Blue Spruce2 on the bench

Continue monitoring and reduce spraying unless outbreaks occur.

Canyon Live Oak1 on the bench

Check for scale and mites. Treat early before overwintering.

Copper Beech1 on the bench

Begin hardening off by reducing nitrogen.

Creeping Juniper1 on the bench

Treat any lingering pests; watch for spider mites resurgence.

Ginkgo biloba1 on the bench

Monitor for late-season mildew or rust.

Hall's Crabapple1 on the bench

Inspect undersides of leaves regularly.

Himalayan Juniper1 on the bench

Treat fungal outbreaks early. Watch for needle browning.

Japanese Larch1 on the bench

Continue pest vigilance.

Japanese Yew1 on the bench

Clear any fallen debris. Fungal risks rise with damp.

Lilac Sensation1 on the bench

Clean debris around tree. Prevent fungal buildup.

Procumbens Juniper Nana1 on the bench

Second spike in spider mites or fungal outbreaks possible.

Satsuki Azalea1 on the bench

Watch for root rot signs. Soil must drain well.

From the wider reference

Canadian Hemlock

Clear dead foliage. Check for lingering pests.

Common Pear

Prepare for fall fungal issues. Clean fallen leaves.

European Smoketree, AKA Venetian Sumach

Continue mildew watch; prune for airflow.

Sawara Cypress

Begin pest clean-up for fall.

Summer protection

11 species

Dawn Redwood5 on the bench

Remove shade gradually if cooling begins.

Chinese Juniper3 on the bench

Reduce full sun exposure during peak afternoon heat.

Canyon Live Oak1 on the bench

Shade may be reduced gradually.

Creeping Juniper1 on the bench

Reduce if nighttime temps fall.

Hall's Crabapple1 on the bench

Reduce midday sun exposure.

Himalayan Juniper1 on the bench

Ease off shading gradually.

Japanese Larch1 on the bench

Maintain partial shading.

Procumbens Juniper Nana1 on the bench

Continue shade until nighttime temps cool.

From the wider reference

Canadian Hemlock

Ease off shading gradually.

European Smoketree, AKA Venetian Sumach

Shade can be reduced gradually.

Sawara Cypress

Phase out by end of month.

Winter protection

3 species

Japanese Larch1 on the bench

Begin thinking ahead.

From the wider reference

European Smoketree, AKA Venetian Sumach

Plan shelter strategy for coming frost.

Sawara Cypress

Prepare mulch or cold-frame strategy.

Wound care

4 species

Creeping Juniper1 on the bench

Safe to prune again if temps stabilize.

Japanese Larch1 on the bench

Monitor and manage heat stress indicators.

From the wider reference

European Smoketree, AKA Venetian Sumach

Healing slows—seal even small wounds.

Sawara Cypress

Sterilize tools and avoid late wounds.

Deadwood & jin

3 species

Creeping Juniper1 on the bench

Resume if needed.

From the wider reference

European Smoketree, AKA Venetian Sumach

Can resume light carving if temps drop.

Sawara Cypress

Safe again if temps drop and humidity rises.

Propagation

5 species

Creeping Juniper1 on the bench

Take semi-hardwood cuttings.

Hall's Crabapple1 on the bench

Graft onto rootstock or try late cuttings.

From the wider reference

Dwarf Jade

Still possible and cuttings still viable, but rooting slows by month’s end.

European Smoketree, AKA Venetian Sumach

End of useful cutting period.

Sawara Cypress

Harden off rooted cuttings.

Development

16 species

Dawn Redwood5 on the bench

Focus on refining branch pads.

Chinese Juniper3 on the bench

Focus shifts to transitioning to fall.

Colorado Blue Spruce2 on the bench

Transition to energy storage phase. No heavy work.

Canyon Live Oak1 on the bench

Begin preparing for fall structural refinement.

Copper Beech1 on the bench

Shift toward preparing tree for dormancy.

Creeping Juniper1 on the bench

Resume minor styling and cleanup.

Ginkgo biloba1 on the bench

Hold off aggressive shaping; begin observing lignification.

Himalayan Juniper1 on the bench

Begin fall refinement strategy—balance apex and lower pads.

Japanese Larch1 on the bench

Strengthen branches through sun exposure.

Japanese Yew1 on the bench

Let growth mature naturally.

Lilac Sensation1 on the bench

Allow shoots to harden. No active shaping.

Satsuki Azalea1 on the bench

Let growth harden off. Begin preparing for dormancy.

From the wider reference

Common Pear

Let growth harden off naturally for autumn. Begin energy balancing.

European Hornbeam

Allow growth to harden.

European Smoketree, AKA Venetian Sumach

Begin wind-down of active development cycle.

Sawara Cypress

Observe growth direction and balance.

Display

4 species

Creeping Juniper1 on the bench

Safe for public view if conditions allow.

Japanese Larch1 on the bench

Keep brief and shaded.

From the wider reference

European Smoketree, AKA Venetian Sumach

Declining; foliage may start fading.

Sawara Cypress

OK only in temperate conditions.