That's what I had concluded in my reading about them .... "height unknown". Though the Black Diamond tag says at maturity it would be 10' tall and 8' wide. I hope that is true!
How tall was yours when you got it? Mine is about 3 1/2' tall in a 1 gallon nursery pot. I have heard they grow fast under their desired growing conditions. Are you growing yours as a standard or as a shrub?
Thanks for sharing your experience and info about them. It took another year or so to make it over here to the eastern part of the USA, so it really IS new for all of us east coast southerners!