Chamaecyparis obtusa 'Kojolco' / Kojolco Hinoki cypress

Chamaecyparis obtusa 'Kojolco' is a dwarf, spreading globose selection of Hinoki cypress with obliquely ascending branches, holding golden-yellow foliage, similar to C. obtusa 'Tetragona Aurea', but without the white highlights toward the branchlet centers. It is also purported to be more resistant to sun scorch. After 10 years of growth, a mature specimen will measure 4.5 feet (1.5 m) tall and half as wide, an annual growth rate of 4 to 6 inches.

This cultivar originated long ago in Japan and introduced to the western nursery trade in the late 1970s by Duncan and Davies Nursery, New Plymouth, New Zealand. Many misspellings and other issues appear in the current nursery trade. The misspelling 'Kojolko' is the most prevalent. In addition, the use of hiba as a suffix in Hinoki cypress cultivars is considered redundant much in the way that the use of sugi in Cryptomeria cultivars, and matsu in Japanese black pine cultivars is.

Chamaecyparis obtusa 'Kojolco' — a specimen in a private garden in Petaluma, California (USDA Zone 9b / Mediterranean climate).
Photo by Jan LeCocq