I have been working with bonsai for about a year and a half, so I am familiar with many of the basic ideas of how to trim and shape trees. However, this last year got away from me with this juniper, these runners kept growing and at first I was going to move this tree into a training pot, but now I just want to reduce its size, wire, and then leave it as is.
My question is, how much of these split runners can I remove? They contain a large amount of the growth tips and I do not want to rob this tree of so much of its energy. I live in Phoenix AZ, so restricting sunlight is the goal, which means they get plenty. They are watered and fed regularily and maintain average temps and hum of about 76* F and 55% respectively. Since I am able to regulate their environment adequately, I expect strong growth patterns. (This tree was also one of 4 I got in the spring so they have not completely adapted to the Phoenix environment but didn’t burn over the summer so they don’t need to recover). I also am posting a view of their habitat with my other trees just to give whoever replies an idea of what I am working with. It’s not the best picture but I can post more later.