Structural pruning

I am having some trouble learning this topic, I know you can do structural pruning on decidious trees after all leaves fall, but I’ve watched videos and I still don’t get it right, when do you do structural pruning on these species?
procumbens nana and ponderosa pine.
I know every pine or juniper is not the same, but I want to have a general idea about this
Thanks for the help!

Did you watch Field Grown Pine Styling Pt. 1?

Pines are developed not built, as for when to start setting structure on pines it is laid out based on different circumstances in the above mentioned video. Strength from pines comes from it’s roots, so is you pine in a bonsai container, when was it potted, how did it grow the following year, is it nursery stock…these are all the questions that don’t allow for a canned answer of “when”.

Where is the energy stored and is the tree in an energy positive or negative are questions I try to start with for a deeper understanding.

procumbens nana is a juniper and it is a different approach than pines.

Sorry I am not advanced enough to give a set time hopefully the video moves you closer to answer given your situation

@NEBeech thanks for the advise no I have not watched that one, but I will go ahead and watch it now. Thanks

The strength of junipers arises from the foliage. Most junipers need to showing some runner (long shoot) growth before they are worked on. The cambium is not well attached when the tree is in active growth so bending at that time can result in branch death. the best times for most work are early spring before growth starts, post-flush harden in the heat of the summer, and as fall dormancy sets in (they can get another flush in early fall).