I was at a nursery in Toronto and they were offering a discount of 30% on most of their nursery stock. I picked up a potted "Ryu Sei". (I had a place for a JM as long as it would remain compact). This specimen is probably about 4.5 feet in height. I would think this is the definition of root bound? And here it is now in the ground. I am curious if others have this variety and the height of your specimen. Would it benefit from protection this winter (I am a zone 5b Cdn)?