- Deciduous shrub
- USDA hardiness zones:
ëUtsu-semi' is an upright, shrubby Japanese maple. It is particularly noted for its heavy-textured green leaves that acquire showy shades of purple and scarlet in fall. It typically grows in an upright, rounded form to 5-7' tall and to 4' wide over the first 10 years, but eventually matures over time to 9-12' tall and as wide. Thick, broad, palmate leaves (to 3\ long and 4\" wide) are divided into broad-ovate lobes (usually 7) with finely serrate margins. Leaves emerge bright green in spring. Small reddish flowers in spring are somewhat attractive on close inspection, but are not showy from a distance."
- Full sun to part shade
Easily grown in moist, organically rich, slightly acidic, well-drained soils in full sun to part shade. Grows well in sandy loams. May be grown in full sun in the northern parts of its growing range, but prefers some part afternoon shade in the southern parts (including St. Louis) of its growing range. New foliage may scorch in full sun locations in hot summers areas, particularly if soils are not kept consistently moist. Mulch helps retain soil moisture and keep roots cool. Avoid hot and dry sites. Site in locations protected from strong winds. Pruning is best kept to a minimum, but if needed should be done in late fall to mid winter. Spring or summer pruning often results in significant bleeding.
Size and growth:
- 9.0 to 12.0 feet
- 9.0 to 12.0 feet
Bloom / flowers:
Insignificant flowers, Good in the fall, Colored leaves, and Red
Japanese maples are generally grown for their attractive foliage and shape. Specimen/accent or group around the home or yard or patio or periphery of the border or rock garden. Good sun-dappled understory tree.
No serious insect or disease problems. Potential disease problems include stem canker, leaf spots, fusarium, verticillium wilt, botrytis, anthracnose and root rots. Potential insect pests include aphids, scale, borers and root weevils. Mites may be troublesome. Foliage tends to leaf out early in spring and is subject to damage from late spring frosts. Chlorosis may occur in high pH soils.