Common Name: Japanese spirea
Type: Deciduous shrub
Zone: 4 to 8
Height: 2.00 to 3.00 feet
Spread: 3.00 to 5.00 feet
Bloom Time: May to August
Bloom Description: White to deep pink
Sun: Full sun
Suggested Use: Hedge
Leaf: Good Fall
Tolerate: Deer, Erosion, Clay Soil, Air Pollution
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.
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.
'Bumalda' typically grows to 2-3' tall and to 3-5' wide. White to deep pink flowers in flattened corymbs appear in a showy bloom from late spring to mid-summer. New foliage emerges with pinkish-purple tinting in spring, matures to dark green by summer and finally turns purplish-bronze in fall. Synonymous with Spiraea x bumalda. Cultivar name honors Ovidio Montalbano (1601-1671) of Bologna, Italy. He used the pseudonym Johannus Antonius Bumaldus when publishing his Bibliotheca botanica (1657).
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.
'Bumalda' reportedly has good resistance to powdery mildew.
Specimen or group for rock gardens. Mass or group in shrub border. Low hedge for path and walkways. Incorporates well into foundation plantings.