It is generally better to prune trees and shrubs in February or early March just before spring growth begins. This is the ideal time to prune fruit trees, shade trees, crape myrtles, shrub roses, hollies and other evergreen plants.
Pruning in late winter minimizes the time the wound is exposed. As trees break dormancy in the spring, their rapid growth will quickly heal over any exposed wounds or cuts.
Continued at... When to Prune.