Spiraea japonica (Japanese Spiraea)
Botanical Information
| Family | Rosaceae |
| Genus | Spiraea |
| Species | japonica |
| Category | Woody |
| Type | Shrub (deciduous) |
| Pronunciation |
Details
| USDA Hardiness Zone | 6 - 7 |
| USDA Hardiness Ref. | |
| Canadian Hardiness Zone | 6b |
| Canada Hardiness Ref. | |
| RHS Hardiness Zone | H6 |
| RHS Hardiness Ref. | |
| Temperature (°C) | (-20) - (-15) |
| Temperature (°F) | 4 - 5 |
| Height | 1.5 - 2 m |
| Spread | 1.5 - 2 m |
| Growth | Medium |
| Flowering Period | July, August |
Description and Growing Information
| General Description | S. japonica is an upright deciduous shrub growing to approximately 2 m tall and 2 m wide. During the midsummer the flattened headed flowers bloom in large clusters of bright pink. |
| Shape | Upright, bushy. |
| Propagation | S. japonica should be propagated during the spring via semi-ripe or softwood cuttings. Additionally, propagation by hardwood cuttings is viable but should be done during the winter. |
| Cultivation | S. japonica prefers full sun but is tolerant of partial shade. It prefers plenty of water during the growing season though caution should be taken as it cannot tolerate saturated soils for extended periods of time. It prefers a rich, moist loam, but it can grow in a wide variety of soils, including those on the alkaline side. |
| Pests | This plant is susceptible to Powdery mildews. |
| Habitat | Japan, China and Korea. |
| Leaf Description | Leaves are generally an ovate shape about 2.5 cm to 7.5 cm long, have toothed margins, and alternate along the stem. |
| Flower Description | Clusters of rosy-pink flowers are found at the tips of the branches. |
Photographs
Spiraea japonica 'Anthony Waterer'
Spiraea japonica 'Goldflame'
Spiraea japonica 'Little Princess'
Spiraea japonica 'Bullata'
Spraea japonica 'Walluf'