Not all trees and shrubs should be pruned in the winter or early spring, however. Generally speaking, shrubs and trees that bloom on new growth should be pruned in the winter and early spring, while those that bloom on old growth should be pruned in late spring or summer (i.e., after their flowers fade).

What month should you trim bushes?

Winter is usually the best time.

Dormant pruning is usually done in late winter, six to 10 weeks before the average last frost in your area. You can prune shrubs at any time of year if it's necessary—for example, to remove broken branches or dead or diseased wood, or to remove growth that is obstructing a walkway.

When should shrubs be cut back?

The best time to rejuvenate large, overgrown shrubs is late winter or early spring (March or early April). Heavy pruning in late winter or early spring will reduce or eliminate the flower display for 2 or 3 years. However, rejuvenation pruning will restore the health of the shrubs.