Winter viburnum species bloom from November to March. Blooming only occurs
on specimens at least 4 to 6 years old. It wafts a very surprising fragrance, with hints of flowers, spices, honey and vanilla.
Set your winter viburnum up preferably to the North, so that the flower-bearing shoots are protected from the morning sun. Indeed, it could make the buds burst after a night of freezing. Best is to plant deciduous varieties during the dormant state (October to March), preferably choosing plants that aren’t too small (24 to 32 inches (60 to 80 cm) tall). Planting distance: about 6 ½ feet (2 meters) whatever the species.
Generally speaking, viburnum is noted for its capacity to adapt to all types of soil, even thick, heavy ones. However, adding abundant organic matter that is well broken down upon planting is always a boon.
Growth is quite slow, about 4 to 6 inches (10 to 15 cm) a year. Winter viburnum grows approximately up to 6 ½ feet (2 meters) high and wide when it reaches 10 years of age. If you can, select specimens sold in containers, they have already developed an entire root system. Stress from planting won’t be as critical.
Proper care for viburnum, snowball bush
Let the shrubs grow for 4 to 5 years after planting, without pruning. After that, prune your adult winter viburnum after the blooming, cutting the shoots that have born flowers back by 2/3ds and balancing the shrub branches out. This keeps the plant from losing branches at the base and encourages the plant to grow more flowers. It is also important to remove dead wood at the end of summer, and to clear the center of the shrub in spring. For specimens that are too bushy, cut back to the ground about one third of the branches that have bloomed every year.
Fragrant viburnum are very beautiful in flower beds. These shrubs are perfect for gardens that try to look natural, as they are for luminous underbrush. But to savor their marvelous fragrance, plant them near the house, near passages that are frequently followed, in a spot that is sheltered from strong and dessicating winds. Well aged manure or compost mulch is recommended every year in spring. During warm summers, remember to water abundantly at the end of the day.