There are several kinds of snowball bush, with types of both Viburnum and Hydrangea laying claim to that provocative common name. Learn all about one cultivar of the former: what it looks like, where to grow it, and how to care for it.
What Is Snowball Bush?
It is important to keep in mind the botanical name of the plant under discussion in this article because several different bushes share the common name, "snowball bush." Here we are talking specifically about Viburnum opulus Roseum. The Roseum cultivar name derives from the fact that the flowers, which start out apple-green and morph to white initially, later fade to a rosy color (as do some hydrangea shrubs). An alternate cultivar name is Sterile, a name reflecting the fact that this is a sterile cultivar: It produces no berries. An alternate common name is "snowball viburnum."
Botanists classify snowball bush as a deciduous shrub.
What Does It Look Like?
This is a fairly large shrub, maturing to 12 feet tall with a similar spread. The leaves are three-lobed and somewhat resemble the leaves of maple trees. Like the latter, they will furnish you with fall color, which is generally a reddish-orange.
Snowball bush is so called because it bears snowball-like clusters of flowers (white in color, rounded in shape, and about 3 inches in diameter). Blooming time in a zone 5 landscape is May, so it can be further classified as one of the shrubs that bloom in late spring. It thus offers visual interest in the landscape during two seasons: spring (with its display of flowers) and autumn (with its fall foliage). Another viburnum that has rounded flower clusters is the highly fragrant Korean spice viburnum (Viburnum carlesii). But the flower clusters on the Korean spice type are smaller.
Where Does This Shrub Grow?
Gardeners in planting zones 3 to 8 can grow snowball bush. The best location for the shrub will be one in full sun (in the North) and with a well-drained, loamy soil (a location in partial shade may be advisable for Southern gardeners).
The species plant, Viburnum opulus (European cranberrybush viburnum) is native to the three continents of the Old World. It bears attractive berries, as does Viburnum trilobum (American cranberrybush viburnum), which is indigenous to North America.
How to Care for Snowball Bushes
Water snowball bush enough to keep its soil evenly moist, as it does not like dry ground. Conserve soil moisture (and suppress weeds, to boot) by applying a 3-inch layer of landscape mulch around your shrub. Prune lightly if needed (for example, if you are growing it in a tight spot) just after the flowering period is over.
Fertilize the plant in spring with a slow-release fertilizer or work compost into the earth around the plant at any time. If you find it too costly to buy compost at garden centers, it is easy enough to make your own compost.
Like most plants, you may occasionally have to treat this shrub for disease problems or bug infestations. Sometimes you can make life easier for yourself by taking preventive measures. For example, it is a good idea to leave space between your snowball bush and other plants to reduce the chance of attack by bacterial leaf spot or powdery mildew. If you notice aphids on the leaves, spray them with Neem oil, an organic insecticide.
What Other Shrubs Share This Common Name?
People apparently find the name of "snowball bush" appealing, because several other plants have commandeered it as their own common name, including:
- Hydrangea arborescens Annabelle: a classic hydrangea mimicked by the more recent Incrediball hydrangea cultivar.
- Viburnum macrocephalum: a very large shrub (it can reach 20 feet tall and wide) with the largest flower heads (up to 8 inches in diameter) among the different snowball bushes.
- Viburnum x burkwoodii: a smaller type of viburnum (8 to 10 feet tall) that inherited some of the wonderful smell of its parent, Korean spice viburnum.
- Viburnum x carlcephalum is a hybrid whose parents are V. macrocephalum and V. carlesii. Its common name is "fragrant snowball," reflecting the aromatic quality of its blooms. It reaches 8 to 10 feet tall and has a vase shape.
Landscaping Uses for Snowball Bushes
Some uses for snowball bushes in the yard are as:
Other Viburnum Shrubs:
- Mapleleaf viburnum (V. acerifolium): Seldom used in landscaping, this North-American native should be valued for its tolerance of cold temperatures (to zone 3) and for the unusual color of its fall foliage, which is a deep pink. Its common name refers to its leaf shape. Its size is 4 to 6 feet tall and 3 to 4 feet wide. The yellowish-white flowers (appearing in May) are followed by berries that are at first red, then purplish-black.
- Arrowwood viburnum (V. dentatum) is another valued for its fall color, which is reddish.
- The flowering display of doublefile viburnum (V. plicatum var. tomentosum Mariesii) offers a very different look from that of snowball bush viburnum. The former sports flat-top flower clusters, in contrast to the latter's globular flower heads.