I have several japanese maple (green, deshojo, kiyo hime) and trident which I wish to bulk up and build basic branch structure in the next 1-3 years. All have been cut back in winter, repotted in generous wooden boxes and have trunk diameters 1-4". I let them grow out this spring with shoots 12-24" in length, then did simple trim and basic wiring. I am not looking to ramify at this time, just wishing to set major branches and gain trunk and branch girth, "Boon style" approach (maple video).
I noticed that most of the spring growth has long internodes, which may make ramification more difficult down the line. How best to build these primary branches? Let the shoots grow long, and cut back to 2-4 internodes sometime in summer? Let them grow all year? Wire will need to come off, as thickening already occurring. Mid year cut back, and let a second flush grow for the rest of the year?