I think my Sango Kaku is showing symptons of Tight Bark. I bought this tree last May and I've already noticed some of the discolorations since then. Now that all the leaves have fallen, it's much more noticeable. Please see my original thread for more pictures: http://www.botanicalgarden.ubc.ca/forums/showthread.php?p=286947#post286947 Can someone confirm that it really is tight bark? If so, am I to prune it off?