Snowballs in summer? With big and bold round white clusters of flowers hanging from the branches in May and June, it's understandable that this magnificent shrub should be known as the Snowball Tree. The leaves of Viburnum opulus 'Roseum' turn to shades of red and purple in autumn, making a wonderful display. Unlike the species, this variety is sterile so it wont produce berries. This shrub thrives in sun or full shade, is easy to grow and maintain, and holds the RHS Award of Garden Merit. Height and spread: 4m (13').