I have a double row wind break of Blue Spruces. I live in Norhtern Illinois so I do see snow loads. I think that the trees may have been planted too closely together so the lower, interior branches have no needles and I assume are dead. I've searched the web and I find conflicting info. on pruning these trees. One hand says to pruning out dead branches, the other hand says to leave them because they support the weight of the upper branches. What is the best for the health of my trees and the integrity of the windbreak? Thanks in advance. Ryan