The work we perform on our trees is very precise and calculated. That is to say, if you aren't sure if you should be doing something, probably best not to do it. All the work we perform has the final product in mind. So the initial question you need to ask yourself is "what do I want from this tree?" If you have a stick in the mud and want a 5" caliper trunk, you probably should just be growing this out for a while. On the other hand, work like repotting is maintenance type work that needs to be performed every few years to keep the tree healthy in a container (not to mention to keep tabs on the nebari).What I need to figure out are things like:
- I have a pair of a bit older juniper nursery stock I haven't done anything with yet...do I practice patience, clean them and work toward beefing them up with a quality repot only for a year or more?
- Are nursery stock better grown up in better bonsai mix, or a denser not-so bonsai mix of good quality?
Bonsai has many exceptions, but when it comes to soil a dense soil is never good, especially not in a container. Regardless if it is nursery stock or whatever, the tree will fare much better in well draining soil. In broad strokes, roots don't like to sit in water. And dense soils in a container will create a water table somewhere in the pot that will always have way too much water and negatively impact the health of the tree (it may even kill it). A coarse inorganic soil mix will retain humidity for long enough while not keeping the roots wet. This will help grow the fine feeder roots you want. This will also allow you to water more often. When the water drains, oxygen will fill the spaces in your soil and your roots will thrive. Potting soil is for.... well, I'm not entirely sure, but it's horrific for bonsai.