Trident maple, moyogi: the first structural wiring

Six years from a 2 cm nursery whip to a tree that finally holds a shape on its own. This record covers the season the trunk line was set, what gauges were used where, and which branches were deliberately left long instead of being cut.

Where this tree came from

The stock was a two-year-old field-grown whip bought bare-root in March 2020, roughly 2 cm across the base and 90 cm tall, with no low branches worth keeping. It went straight into a 12 litre air-pot with a mix of 60 percent akadama, 30 percent pumice and 10 percent horticultural charcoal. The first three seasons were spent doing nothing but growing a sacrifice leader to thicken the lower trunk, cutting it back each winter to a bud facing the direction the next segment should travel. By the end of 2023 the base measured 6.5 cm, which is the point where trunk development stops being cheap.

Reading the trunk before you touch it

Photograph the tree from four sides against a plain background, then stand the prints side by side and look for the side where the base flares widest and the trunk already leans slightly back over it. That side becomes the front. On this tree the widest flare faced what had been the south-east, and the natural lean was about 12 degrees away from the viewer, which is close to the classic moyogi line and needed almost no correction. Mark the front with a small piece of tape on the pot rim, and do not move it for the rest of the session; more trees are ruined by a changing front than by bad wiring.

Gauges and order of work

Wire from the base upward, thickest first. A 2.5 mm anodised aluminium wire went on the trunk, spiralled at roughly 45 degrees, with the coil pitch around 1.5 times the trunk diameter. Primary branches got 1.5 mm. The rule that has served best is that the wire should be one third the thickness of the part it holds; if the branch bends under the wire without the wire itself deforming, the gauge is too thin and you will get spring-back within a fortnight. Set the trunk first, then the branch that occupies the largest empty space, then the one directly opposite it, and only then the fine work. Order matters because each bend moves everything above it.

What was left long on purpose

Three shoots on the right-hand side were left at 40 cm rather than cut to two nodes. They are sacrifice branches, kept to thicken the callus where a large branch was removed in 2024, and they will stay until the wound has closed flush — probably another two seasons. Leaving them makes the silhouette look wrong for now, and it is worth it: removing them early would give a tidy tree today and a sunken hollow on the trunk in five years.

Aftercare through the first summer

The tree stayed in dappled shade for ten days after wiring, then moved to full morning sun. Watering was once daily in the morning and a second pass on any day above 30 C, always until water runs freely from the drainage holes. No fertiliser for three weeks after wiring, then a half-strength liquid feed every fortnight until the end of August. The wire was checked every ten days by running a finger along it; by early August the trunk wire was biting slightly at the second coil and was removed, giving four months of set which is enough at this stage of development.