Hi, I have a small weeping willow tree, 8" dia. trunk which I pruned way back last winter. I left two thick branches at the top, but only about 2 ft. long. Now the tree looks great, healthy, doesn't throw much shade with it's "mop of hair". Just what I wanted! So my question is: What if any consequences will there be if I do this same radical pruning every year? Will the tree eventually loose vigor by expanding that much energy into all new growth every Spring? Thank for your advise.