I had this Scots pine years ago and after twisting the trunk, I sorta lost interest in it and gave it to some friends just to plant in their yard.
They neglected it and the pot fell over and exposed the roots and turned it into something really NEAT!
I potted the tree for them and they kept it on their patio but after about 10 years of no feeding and strange watering, they didn't want it any more because it frankly looked awful. Chlorotic and dull.
The needles are FIRMLY stuck in so the tree is healthy now that I have repotted it in Akadama soil.
NEW needles are green and vigorous, but no one in the local area even SELLS Scots pine.
Are they tough to backbud and when should pruning take place?
I prune my black pine in the spring.