pruning a viburnum shrub
Typically, viburnum shrubs should be trimmed back about a third of their size each year. Most pruning is done for shaping purposes only. However, old or overgrown shrubs may require some rejuvenation.Thinning out of unsightly branches can help open these shrubs up as well.f course, much of viburnum pruning depends on the variety grown too. In many cases, pruning just after flowering but before the setting of seedpods is sufficient. If frost is imminent in your area, you should put off pruning so as not to damage new shoots.