okay so I have a little orchard with a couple apple pear and cherry trees. It has'nt been taken care of for the last 10 years or so. The snow has taken a toll on them and I started pruning them back, They are dwarf trees so I think they are only supposed to be 10-12 feet tall? I shortened the horizontal branches a bit and cut the vertical shoots. I want them to produce a little more than they have been but am really more concerned with long term health and limiting the snow damage, I sometimes get 4+ feet of wet snow. Can I cut them back in the fall or should I only trim in the early spring? I think they were planted about 15 years ago.