It is obvious why Spiraea x cinerea 'Grefsheim' has been awarded the coveted RHS AGM! This deciduous shrub is simply amazing in late April and early May, when the 'Bridal Wreath' Spirea is covered in a mass of white flowers. They are set off against a backdrop of grey-green leaves and the stems adopt a graceful, arching habit. Easy to grow, this plant makes a wonderful specimen and it's great for biodiversity too as the flowers attract beneficial insects and the stems and foliage provide cover for birds. Height: 1.5m (5'). Spread: 1.5m (5').