When is the Best Time to Prune?
When you can’t wait to get started in the spring garden, a good task to undertake is pruning. Most trees and shrubs benefit from annual pruning. It keep them in shape, gets rid of dead and diseased wood and encourages new growth. But not all trees and shrubs should be pruned early, especially some of the flowering ones.
Early spring bloomers set their flower buds the fall before. Pruning them early in the spring would mean losing some blossoms. Most of the time this is not what you want. However there are exceptions. It’s often easier to prune when you can see the shape of the plant, before the branches are masked by leaves. Trees and shrubs that are in need of a good shaping could sacrifice a few blooms to be invigorated by a spring pruning.
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SOURCE:
http://gardening.about.com/od/treess...TreeShrubs.htm
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