I have a couple of single yellow NOID brugs. In the fall I cut them back to take them into the house for winter. For some reason all of the pruned branches have died back 6 or 7 inches. In some cases it went down past the Y area. Any idea why I had the die back? They are now coming back to life and sprouting leaves at the base and long the live parts of the stem, but the dead parts are really dead. I'm afraid if I cut that part off it'll die back even more. Have any of you had this happen?