Trimming Trees

[Sonja Thompson]

We have an apple tree, two pistachio trees and some oleander bushes.
What is the best month to trim these trees?
We are living in New Mexico but it can get below freezing point in the winter.

 

[John Paul Sanborn]

If you have fire bilght in your area, then winter is best for major pruning.

Here is a search I keep on proper pruning, the first hit is from T. A&M

http://search.dogpile.com/texis/search?q=proper+pruning&geo=no&fs=web