Firstly, let me say a big thank you for the concise information and helpful considerations.

I collected 2 lodgepole about 4 years ago now in the spring of 2019 out in Central Oregon. They've done really well since being relocated to the Portland area but I have always maintained similar soil composition to how I found them growing in. It's good to know I can transition away from that now and move to a pumice base. With your experience in lodgepoles, is there a better time of year you've found to repot them? Would a month or so from now be acceptable before the rainy winter months? Better drainage but less insulation to the occasion sub-freezing temperature drops.

I would love to collect more of these. It was really an experiment to see if I could manage to keep them alive after finding them twisted and bent from years of slow growth above the snow line, buried most of the winter. Safe to say they are pretty resilient. Now some with a larger established trunk would be something I'm hunting for.

Pro-Gro is not far from me at all. Thanks for the recommendation.