UPDATE...
t's been 4 years since I embarked on this mission. Most are just growing out while keeping lower future tree branches in check.
So i decided to mess with this one, last spring I cut the water bottle back by half where I was making negari roots. Then today I finished removing the rest of the bottle,raked out the surface soil some, chopped the top and wired the new leader and other top branch.
For some reason the youtube upload is garbage. But the pics are good to go. I'm also. Considering re wrapping the roots in hopes they'll bulk up some.
youtube.com