Spiraea japonica ('Shirobana') 'GENPEI'

Spiraea japonica ('Shirobana')
Spiraea japonica ('Shirobana') 'GENPEI'
Japanese spiraea
SIZE/TYPE medium-sized shrub
LEAVES deciduous broadleaf
COLOUR OF FLOWERS +multicolored:white and pink
LOCATION full to partial sun
USDA zone (lowest) 4   (down to -34°C)
FOR ZONE 5+6 Code of winter protection zone 5+6
FOR ZONE 7 Code of winter protection zone 7
BELONGS TO CATEGORIES Deciduous broadleaf
Summer blooms
náhled foto
Spiraea is a common shrub of Central-Europeans parks. This low-maintenance plant is available in many species and varieties each of which offers a different feature. Even thoug public plantings often offer the same one over and over, and the only job done to avoid absolute neglect is radical pruning to bizarre shapes that don’t suit this plant at all, spiraea can be a pretty plant if used sporadically and well located in the garden.

Genpei is a newer preferred name for this variety of Japanese spiraea that is commonly available in the nursery trade as Shirobana. It is truly an interesting piece with bi-coloured flowers. The corymbs come out in either rich pink colour or pure white. Sometimes one corymb may consist of flowers of both the colours and it has nothing to do with flower maturity. The leaves are a little darker green than on the species, more narrowly elliptic, shallowly serrated at margins. If regularly deadhead, at least once a week, the shrub will continue looking pretty and fresh without those ugly and dry seedpods. Moreover, blooming can be extended to early September this way. It naturally forms a low shrub of somewhat prostrate habit if neglected.

Spring pruning will encourage new growths and the plant will get thicker and will flower more profusely. You can cut off up to two thirds of previous year’s growth or trim the twigs to achieve a desired shape. It is widely soil adaptable but does best in slightly acidic, fertile, constantly moist soil in full sun. Fully hardy to about -34°C (USDA zone 4) and suitable for outdoor pots.

Last update 04-02-2014

  • STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
  • DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
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  • GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.
LARGE PLANTS over 150 cmspecimens, screening and hedging shrubs

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