Bonsai Collection

BN-01

Acer palmatum — Japanse esdoorn — Japanese maple
BN-01
StageYoung whip / pre-bonsai
ContainerNursery pot
Trunk~1 cm at soil line
Photographed2026-07-19

1:1 Structure Map

BN-01 structure map

Projected Development

BN-01 projected development

Style Recommendation

Informal upright (moyogi)

The trunk already carries natural movement - a slight lean and curve from the base up through the low shoots to the second Y-split - rather than growing dead straight, which rules out formal upright. There's no single dramatic bend or cascade to justify a more specialised style (slanting, cascade, literati), and the material is too young and thin for a multi-trunk read. Informal upright is the style this trunk line is already volunteering for, and it's the most forgiving style for a whip this age: it tolerates the leader being chopped and regrown over several seasons as taper develops.

The structure at marker 1 currently has three shoots competing near the same height (the dominant left leader, the subordinate at marker 2, and the weaker third leader at marker 6). Keeping three thick shoots this close together would thicken the top of the trunk and erase taper, so the plan below narrows this to one clear leader with one supporting branch, which is the standard first move on whip material like this.

Development Timeline

PhaseWindowGoal
0 - Establish Now (summer 2026) No structural cuts this season - wrong time of year for Acer palmatum. Let the chosen leader and branches run to build trunk and branch girth. Light pinching only.
1 - Select structure Late winter - early spring 2027 Remove the weak third leader (marker 6), pick one of the two low shoots (marker 3) as the first branch, repot and clear the dead stub (marker 5), check the root flare (marker 4).
2 - Build ramification 2027 - 2029 Grow-and-clip cycles each spring on the retained leader and the subordinate pad (marker 2). Chop-and-regrow the apex every 1-2 years to keep taper as the trunk thickens.
3 - Refine 2029 onward Fine ramification and leaf reduction on the developed pads; move from nursery pot into a training or bonsai pot once nebari and taper are established.

Maintenance Action Plan

DateMarkerAction
Now - Oct 2026 No cuts. Pinch back any single shoot that's clearly outrunning the others (past 4-5 leaf pairs beyond the rest of the canopy) to keep growth even.
Nov 2026 (leaf fall) 12 Optional: light wire on the leader and subordinate branch for gentle movement. Remove wire within 6-8 weeks - don't let it bite in over winter.
Feb - Mar 2027 (before bud break) 63 Main structural cut: remove the weak third leader at marker 6 flush to the fork. Compare the two low shoots at marker 3 and cut the weaker/worse-placed one, keeping the other as the first branch.
Mar - Apr 2027 (buds opening) 54 Repot into fresh soil (same pot or one size up). Remove the dead stub (marker 5) at soil level. Inspect the root flare (marker 4) and correct if roots are circling.
Apr - Jun 2027, then every spring 2 Pinch new extension growth back to the first leaf pair on the leader and the subordinate pad to start building ramification.
Every 2 years, spring Repot. Acer palmatum roots fill a pot quickly at this age.