Culture
Best grown in moist, rich, fertile, acidic, well-drained soils in full sun. Tolerates light shade. Soils should not be allowed to dry out. Site in a location protected from drying winter winds.
Noteworthy Characteristics
Cryptomeria japonica, commonly called Japanese cedar or sugi, is a slender, pyramidal, evergreen conifer with tiered horizontal branching, which is slightly pendulous at the tips. Japanese cedar is a monotypic genus unrelated to the true cedars (Cedrus). It is native to forested areas in Japan and China where it typically grows as a single trunk tree to 150’ tall (infrequently taller) with an 8’ trunk diameter. It is the national tree of Japan where it is often planted at temples and shrines. In cultivation in the U.S., it grows much smaller, more typically to 50-60’ tall. Sharply-pointed, awl-shaped, fragrant, green to blue-green needles (to 3/4” long) are spirally arranged. Foliage is soft to the touch. Foliage may bronze in cold winters. Spherical fruiting cones (to 1” diameter) appear at the shoot ends. Reddish-brown bark exfoliates in strips.
This is a prized timber tree in its native habitat.
Compact and dwarf cultivars are commonly sold in commerce.
Genus name comes from the Greek krypto meaning to hide and meris meaning a part in reference to the flower parts being hidden.
Specific epithet means of Japan.
'Radicans' is a fast-growing tree with a columnar to pyramidal growth habit. It has dense, blue green, feathery foliage that retains its color in winter with less bronzing than other Japanese cedars. ‘Radicans’ grows 30 to 40 ft. tall (sometimes up to 50 ft.) and 15 to 20 ft. wide. It is less prone to tip blight and leaf spot but is more susceptible to root rot when young.
Problems
No serious insect or disease problems. Leaf blight and leaf spot.
Uses
Species trees as a large specimen tree. Screen. Dwarf cultivars make good rock garden plants.