And by the way - it isn't a sin if you don't have the right pot, or want to pot your tree in a bigger pot in the short term to give it room to grow as a training pot, etc. Good trees are expensive - good pots are too. You will often see people on this site saying "the tree is currently in the wrong pot" or "I need to find a better pot for this tree". Trees change... the pot you had it in five years ago may suddenly not look as fitting, or you may just want to try something new for a change. However I'm just going to say - if you buy your tree at Home Depot and it comes in one of those square blue glazed pots - those pots aren't good for any tree that I have ever seen

Doesn't mean to throw it out - or not use it. But just embrace its ugliness and unsuitability for anything but your beginner trees