Common Name : Koyama’s Spruce
Scientific Name : Picea koyamae
Zone : 5
Height : 50 to 60 feet
Width : 25 to 40 feet
Grow in average, medium moisture, well-drained soils in full sun. Tolerant of light shade. Prefers rich, moist loams. Adapts to both wet and dry sites. Generally tolerant of urban conditions. Regular pruning and spraying is advisable>
Monoecious. Evergreen tree to 20 m tall and 40 cm dbh, with a straight round trunk and long, slender, horizontally spreading branches. Bark smooth and brown on young trees, turning gray-brown, peeling off in thin scales; on old trees black-grey, rough and scaly. Branchlets brown, grooved, glabrous; pulvini stout, 0.8-0.9 mm long. Leaves linear, quadrangular, 8-12 mm long, 1.5 mm across, acute on young branches, obtuse on fruiting ones, pale green, with a prominent stomatiferous band in each surface; resin canals one or two, marginal. Flowers May to June. Pollen cones on previous year’s shoots, cylindric, red-brown, with numerous stamens. Seed cones erect, solitary, terminal on previous year’s shoots, reddish purple, cylindric, pendulous, 4-8 cm long, 2-2.5 cm across. Seed scales thinly woody, orbicular-obovate, cuneate to base, ca. 15 mm long, 13-16 mm wide, minutely denticulate on upper margin. Bract scales ca. 3 mm long, obovoid, apex acute. Seeds fusiform, black-brown, ca. 3 mm long, 2 mm across; wings pale brown, oblong-obovate, ca. 10 mm long, 5 mm wide
It is occasionally planted as an ornamental tree. The wood is similar to that of other spruces, but the species is too rare to be of economic value.