Thanx. Been through your thread and learned so much.
Notices this specific one was September so that's early spring.another post looked liked you cut it in December, summer.
What would be the best time, spring or summer?
A lot of stuff will influence what you do and when. Sure, basic timeline is one of these things - decandle in summer for JBP etc… but like most (all) things with bonsai, the answer is generally “it depends”.
Best time to cut a tree in my experience is when it is at its strongest. Throwing out new growth and looking super healthy. If you cut a tree then (elm, pine, maple, melaleuca… whatever) it will respond and generally new buds/growth is the reaction. Timelines and seasons give you a guideline but the growth of the tree is the driving factor for me, because growth helps to cancel out other factors. Example : if you repot and cut roots heavily, a tree might take a bit to recover. If you assess the growth (rather than the season/timing) you’ll see it is slow and leave it until it strengthens. If you cut on a timeline irrespective of what the tree is showing, in the long term I would say that is going to be bad for the tree.
Probably not the answer you want, but the answer I give nonetheless… apologies!