There is alot of different information about this plant out there, all of it conflicting. Starting with the spelling. My original plants came from NC State arboretum by way of  Specialty Ornamentals and were labeled 'Gyo Kruya'. I still prefer this spelling but it seems that 'Gyo Kuryu' has become more widely accepted. I am not sure which is correct and have seen other spellings also.  I have been growing this cultivar for about 15 years and there is alot of contoversy about size and diferent plants available in the industry. The thing is this plant has a nesting habbit when young and attains height very slowly, but later sends up vertical shoots that grow much faster. Some believe these vertical shoots are sports or reversions, I am not sure one way or the other because it seems to be too predictable to be a sport and I am not sure what it would revert to. I do know this, if the grower takes his cuttings off the latteral banches that grow nesting and stay smaller then you will have a slow growing plant that will stay smaller about 3 to 4 feet in ten years. The plant is easy to keep at this size with minimal pruning to take the vertical shoots off that will eventually appear on top. I have 15 year old plants that are 4 feet tall that I prune about once a year. Now here is where it gets complicated. Some growers take their cuttings off the top vertical shoots and these plants skip the nesting stage and grow straight up with much larger internodal seperation and can grow 10 feet or more in ten years. Either way the dark foliage is beautiful and they do not bronze in winter.