Viburnum opulus 'Sterile', commonly known as Snowball Viburnum or European Snowball Bush, is a deciduous shrub belonging to the Adoxaceae family. It is a cultivar of the European Cranberrybush Viburnum (Viburnum opulus), known for its large, showy, white flower clusters that resemble balls of snow, hence the name "Snowball."
Unlike the species plant, which produces both sterile and fertile flowers, the 'Sterile' cultivar only produces sterile flowers, meaning it doesn't produce fruits or berries. This can be desirable for gardeners who want to enjoy the aesthetic appeal of the flowers without dealing with the mess of fallen fruits.
'Sterile' is a popular choice in gardens and landscapes for its ornamental value. It typically blooms in late spring to early summer, attracting pollinators such as bees and butterflies. The shrub has a rounded habit and can grow to be quite large, making it suitable for use as a focal point in the landscape or as part of a mixed border. It prefers moist, well-drained soil and full sun to partial shade.
Overall, Viburnum opulus 'Sterile' is valued for its attractive foliage, beautiful flowers, and low maintenance requirements, making it a popular choice for gardens in temperate regions.