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. & the foliage has a dark-bluish underside. Flowers May-June. Height 150-200cm. Supplied in a 3 litre pot.