Chamaecyparis pisifera 'Piccolo'

A rare cultivar of Sawara Cypress that we obtained years ago. We may be the only source of this cultivar at this time. If anyone finds this elsewhere, please let us know, as information is difficult to find. The plant we have is over 10 years old, is 18 inches tall and 2 ft wide with soft feathery medium green foliage. I would expect the hardiness to be zone 4, as other Chamaecyparis pisifer cultivars