The Viburnum Snowball Bush refers to a popular cultivar of Viburnum, specifically Viburnum opulus 'Roseum' or Viburnum opulus 'Sterile'. This shrub is known for its large, round clusters of white flowers that resemble fluffy snowballs, hence its common name. Here are some key features of the Viburnum Snowball Bush:

1. Appearance: The Viburnum Snowball Bush is a deciduous shrub that typically grows 7 to 8 feet tall and 4 to 6 feet wide, though some varieties may reach larger sizes. It has a dense, rounded habit with multiple stems. The dark green leaves are ovate or lobed and turn reddish-purple in the fall, adding further ornamental interest.

2. Flowers: One of the most distinctive features of the Viburnum Snowball Bush is its large, round clusters of white flowers. These blooms appear in late spring to early summer and can measure 3 to 6 inches across, creating a stunning visual display. The flowers are sterile, meaning they do not produce fruit, and they are often described as looking like fluffy snowballs.

3. Fragrance: Some varieties of the Viburnum Snowball Bush have a sweet, pleasant fragrance that adds to their appeal.

4. Hardiness: The Viburnum Snowball Bush is hardy in USDA zones 3-8, making it suitable for a wide range of climates.

5. Sunlight: This shrub thrives in full sun to partial shade. While it can tolerate some shade, it will produce the best flower display in full sun.

6. Soil and Watering: The Viburnum Snowball Bush prefers moist, well-drained soil but is adaptable to a variety of soil types. They are relatively drought-tolerant once established, but benefit from regular watering during dry periods. 

7. Landscape Use: The Viburnum Snowball Bush is often used as a specimen plant in mixed borders or as a focal point in the landscape. It can also be planted in groups or used as a hedge or screen.

8. Maintenance: The Viburnum Snowball Bush is relatively low-maintenance. It benefits from regular watering, especially during dry periods, but is tolerant of occasional drought once established. Pruning can be done in late winter or early spring to maintain shape and remove any dead or damaged wood.

Overall, the Viburnum Snowball Bush is prized for its large, showy flowers, attractive foliage, and ease of care, making it a popular choice for gardens and landscapes.