Only prune in early spring, before flowers and before the plant leafs out. Crossing, badly formed or damaged branches should be removed back to a main branch. Low branches should also be removed, if a tree form is desired, when the plant is young.
Can you prune Cornus mas?
No routine pruning is needed, although bushes can be cut back any time while dormant if they are becoming too large The Royal Horticultural Society has given it the Award of Garden Merit (AGM).
How big do Cornelian cherry trees get?
Cornelian cherry dogwood is a slow-growing, deciduous, small tree or large shrub with a height of 15 to 25 feet and spread of 12 to 18 feet.