Cryptomeria japonica 'Ryoku Gyoku' / Ryoku Gyoku Japanese cedar

Cryptomeria japonica 'Ryoku Gyoku' is a irregular-globose, extremely slow-growing selection of Japanese cedar with dense, miniature dark-green awl-like foliage that will assume a light-bronzy cast in winter in colder climates. After 10 years of growth, a mature specimen will measure, at best 8 to 10 inches (20 - 25 cm) tall and wide, an annual growth rate averaging less than 1 inch (2.5 cm).

This cultivar originated as a witch's broom found in the late 1990s on a containerized specimen of C. japonica 'Tansu' by Edsal Wood of Aurora, Oregon, USA at his nursery, Bonsai Village. The cultivar names loosely translates into "Jade Ball" in the Japanese language.

Cryptomeria japonica 'Ryoku Gyoku' at the ACS Reference Garden, Oregon Garden, Silverton. A stunning older specimen; clearly one of the first propagated.
Photo by Patrick Breen, Oregon State University
Cryptomeria japonica 'Ryoku Gyoku' — a closeup of foliage detail.
Photo by Patrick Breen, Oregon State University