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Hereof, can you trim a snowball Bush in the fall? Old-Growth Bloomers Prune smooth-leaf hydrangea and Chinese viburnum after they finish blooming in summer or early fall. Do not prune either after August 1. Cut back dead or diseased branches anytime they appear. Deadhead, or. If you choose to prune this bush, do it after the flowers fall off in early summer. Can you keep a snowball bush small? A: The best time to prune a snowball bush, Viburnum macrocephalum, is after it finishes blooming and the white flowers have turned brown.
Keep in mind that this shrub is. Mar 26, Prune a snowball viburnum bush by sterilizing the equipment, cutting off flowers and cutting back the older branches before the fall. To complete this project, you need bleach, a bowl of water, two clean cloths and pruning shears.
Sanitize the pruning shears Pour a cap full of bleach Estimated Reading Time: 1 min. Sep 21, Prune viburnum bushes in the spring as soon as the last flowers fade. Snowball bushes bloom on old wood or last season's growth.
Pruning any time past late summer will risk removing precious bloom buds. The snowball bush, a cherished, old fashioned garden shrub that produces fluffy balls of summery white blooms, is a member of the Viburnum genus. Snowball bushes have a lovely natural shape; avoid trying to force the tree into an unnatural shape, otherwise known as a"haircut" pruning.