Japanese Spirea
Spiraea japonica · Deciduous shrub, Broadleaf, Hardwood
Plant Family
Rosaceae
Tree Category
Ornamental Flowering Shrub
Variety / Cultivar
Standard species type (or various cultivars like 'Little Princess' or 'Goldflame')
Hardiness Zones
USDA Hardiness Zones 4 through 8, demonstrating wide climate adaptability and cold hardiness.
About This Tree
A compact, multi-stemmed deciduous shrub typically growing to 3 to 6 feet tall with an equally wide or wider spread. It features a dense, rounded, mounded habit with fine-textured foliage and small pink to rose-purple flowers clustered at the branch tips.
Leaf Characteristics
Simple, alternate leaves, ovate to lance-shaped, generally 1 to 3 inches long, with sharply serrated margins and a pointed tip. Light to medium green in summer, sometimes developing subtle yellow or reddish tones in fall.
Bark Characteristics
Smooth, slender reddish-brown to dark brown stems when young, becoming slightly ridged, grayish-brown, and peeling or exfoliating lightly in thin strips on older branches.
Growing Information
Origin Region
Native to Japan, China, and Korea; widely naturalized and cultivated across North America, Europe, and Asia.
Growing Season
Spring leaf-out followed by flat-topped flower clusters in late spring to mid-summer, going dormant in late autumn.
Sunlight & Water Needs
Thrives in full sun to partial shade. Prefers average, medium moisture, well-drained soils, but establishes good drought tolerance once mature.
Mature Size
Reaches 3 to 6 feet in height and 3 to 6 feet in spread. Fast to moderate growth rate with a typical lifespan of 20 to 30 years.
Special Characteristics
Highly valued for its abundant summer flowers, ease of cultivation, tolerance of urban pollution, and adaptability to various soil types. Can become invasive in certain naturalized woodland settings.
Wildlife & Ecology
Provides nectar and pollen for beneficial insects, butterflies, and native pollinators. The dense branching structure offers light cover and nesting sites for small birds.