Clematis Summer Snowfall 2LClematis Summer Snowfall is an herbaceous perennial, not a climber; growing to a maximum height of 40cm. Bearing dainty, white, small, bell shaped flowers, it is best planted in full sun with its roots in the shade. Use it as a contrast against coarser planting or position it near a low growing shrub so that the stems can splay into the bush for extra support.