Common Name: Japanese spiraea
Type: Deciduous shrub
Family: Rosaceae
Zone: 3 to 8
Height: 1.00 to 1.50 feet
Spread: 2.00 to 2.75 feet
Bloom Time: June to September
Bloom Description: Pink
Sun: Full sun
Water: Medium
Maintenance: Medium
Suggested Use: Naturalize
Flower: Showy
Leaf: Colorful
Attracts: Butterflies
Tolerate: Deer, Erosion, Clay Soil, Urban Conditions
Culture
Easily grown in average, medium moisture, well-drained soils in full sun. Tolerates light shade. Tolerates a wide range of soils. Prefers rich, moist loams. Remove faded flower clusters as practicable (light shearing is an option) to encourage additional bloom. Flowers on new wood, so prune in late winter to early spring if needed. Plants can be aggressive self-seeders, and have escaped gardens and naturalized in many areas of the eastern U.S. Plants will also spread in the garden by suckering.
Noteworthy Characteristics
Spiraea japonica, commonly called Japanese spirea, is a dense, upright, mounded, deciduous shrub that typically grows 4-6’ tall with a slightly larger spread. Leaves (to 3” long) are oval and sharply-toothed. Tiny pink flowers in flat-topped clusters (corymbs) cover the foliage from late spring to mid-summer, with sparse and intermittent repeat bloom sometimes occurring. Flowers are attractive to butterflies.
Genus name comes from the Greek word speira meaning wreath in reference to the showy flower clusters seen on most shrubs in the genus.
Specific epithet means of Japan, which is part of its native range.
‘Mertyann’, sold under the registered trade name of DAKOTA GOLDCHARM®, is a dwarf, compact, mound-shaped summer blooming spirea originating from S. japonica ‘Little Princess’. New leaves are golden-bronze, changing to golden-yellow as they mature and the yellow color is retained well into summer. Bright pink flowers are produced in clusters two to three inches across. Flowers are abundant in early summer followed by scattered flowers the remainder of the growing season. Suitable for foundation, border and rock garden planting.
Problems
No known serious insect or disease problems. Spireas are generally susceptible to many of the diseases and insects that attack other rose family members, including leaf spot, fire blight, powdery mildew, root rot, aphids, leaf roller and scale.
Uses
Specimen or group for rock gardens. Mass or group in shrub border. Low hedge for path and walkways. Incorporates well into foundation plantings.