There are a lot of people on here that are more knowledgeable than me, but here is my 2 cents worth:
In the South, the ideal pruning season is over since the trees are starting to bud. The rule of thumb is to do most of your pruning after a week or two of hard freeze but before it gets warm in the spring.
If you have trees and bushes that bloom in the spring, you don't prune in the winter. You wait until the blooms drop and do it shortly afterward (like azaleas here in the south - prune them in May or June).
Fruit trees have their own rules & methods and I don't know much about them.
You can prune decidouos trees in the summer, but they will generate a bunch of water sprouts that you have to deal with and that take energey away from the tree.
Just spilled everything I know in one message, whew.
