Recently got a 1 gallon Hubb's and while reading up on the cultivar online, I'm seeing a lot of conflicting information. One site describes it as an "unusually vigorous" grower, reaching up to 12 feet in 12 years, while another describes it as slow-growing and reaching 6-8 feet at maturity. I know these sort of conflicting descriptions are not uncommon with rarer cultivars, so I'n hoping for some firsthand experience. Does anyone actually have one of these in their garden? Any pictures and/or comments about the actual growth habit and size?