Viburnum Shrubs are part of a vast genus; there are more than 150 species of Viburnum. Viburnums are trouble-free and attractive for their flowers, fruits, fall foliage, and shape. Viburnums are frequently grown as privacy screens or filler plants. Their plentiful berries attract birds and other wildlife. Many viburnums provide colorful fall foliage. Many retain their berries into winter, making them attractive in all seasons. Viburnums bloom in mid to late spring. Depending upon the variety, viburnums can grow from 5 to 15 feet tall and wide, The Black Haw Viburnum is grown by some people as a shrub, while others allow it to become a tree. If used as a shrub, your viburnums should get to a height of around 15 feet. If used as a tree, they can reach a height of upwards of 30 feet. The Arrowwood Viburnum is a unique flowering shrub. In the later spring and early summer months, large white blossoms develop. In the fall the glossy green leaves change from green to yellow to red and then finally a dark purple. Not only do the leaves go through this transformation, but clusters of berries emerge.