Spiraea nipponica White Carpet or Spiraea nipponica 'Gelspir' is a very low growing, deciduous shrub with an upright habit that produces waves of small white flowers in June that lay like a carpet over the plant. When there are no flowers it is still pretty to look at with its lush green foliage arranged symmetrically along each stem. And the foliage has a dark bluish underside. Flowers May June. Height 150 200cm. Supplied in a 3 litre pot.