Ginkgo biloba 'Rocky' originates from the Unites States of America. This exceptional dwarf cultivar and was introduced in 2006 by the late Bill Janssen of Collectors Nursery, which is in the Southwest corner of Washington State. It is a haploid cultivar, which accounts for some of its distinctive features. This is an appealing plant and is well suited to growing in a container or as a specimen shrub.
 
A further word on 'Rocky.' The same year as they introduced 'Rocky,' Collector's Nursery also introduced 'Bullwinkle.' That description: "New! 2006 Collector's Nursery introduction. A beautiful broadly weeping form with large glaucous green leaves shaped like moose antlers. Bright gold fall colour."  The problem I see with both 'Rocky' and 'Bullwinkle' is that Bill Janssen does not tell us where he got the original material. Is it something he found in the wild? Is it something that originated in his collection? Is it something unnamed from someone else's collection that he put a name to. With his passing, we won't have answers to those questions. Although his nursery partner Diana Reeck to my knowledge is still alive, just not in the nursery business as far as I know.
 
Description - Ginkgo biloba 'Rocky' has small slightly bluish leaves and the branches spread conspicuously horizontally away from the main stem. By mid-summer the plants develop a pale-yellow edge that persists into autumn until the leaves develop full autumn colour and drop. This transition of foliage colour is quite attractive and certainly a most unique feature in a Ginkgo. Leaf size is about 8 cm and its annual growth rate is 10cm  to 20 cm. We expect this relatively new cultivar to be 90 cm high and 1.2 m wide in 10 years.