Viburnum blue muffin (Viburnum 'Christom') delights gardeners with its bright blue berries. While the berries are inedible, viburnum adds visual interest to a yard in spring with its large white blossoms and again in the summer as its blooms give way to berries. Viburnum blue muffin is a small shrub, growing no more than 7 feet tall and 6 feet wide. Ideal for containers or hedge planting, viburnum blue muffin benefits from annual pruning and shaping.
Prune the virburnum blue muffin in late spring after the white flowers have dropped.
Remove dead or diseased branches at their base using anvil pruning shears. Spray the pruners with disinfectant spray between each cut to reduce the chance of spreading disease. Discard all diseased and dead wood in a garbage bin.
Thin out the shrub canopy by removing older, woody growth from the interior. Clip off these branches at their base using anvil pruners. Remove up to one-third of this older growth each year to promote the development of new, flowering wood.
Head back the viburnum shrub if it has grown too large or too wide. Shear back the shrub by 3 to 5 inches using hedge clippers. Work at a uniform angle throughout to avoid cutting too much growth off one side of the shrub.
Shorten lengthy branches by hand as an alternative to heading back the viburnum blue muffin. Select extra-long branches and trim them back by 3 to 4 inches.
Strip off any low-hanging branches that may get trampled to the ground by dogs or other critters. Cut these back at the base using pruning tools.