Pines are pretty funny. I have grown a number of species and sometimes it's the weirdest ones that do well for me... banksiana/tabuliformis/pungens/taeda. I avoided JBP because they just didn't do anything for me, then I decided I was missing out so I purchased 2, and killed them very quickly. I guess the species feels the same way about me. I would highly recommend you restart this experiment with Jack pine, they are one of the fastest growing species of pine on earth during their first 15 years of life. I can verify that stat but won't bother until provoked. Extremely cold hardy but don't mind intense heat. They have a bad reputation for being fickle but that's only when they are collected from the wild.