Our beautiful weeping willow is barely leafing out this spring. Apparently the Denver area had a tough time in nov 2015. We had an odd winter and warm weather seemed to cause it to bud prematurely and then the buds dies when the cold came. The tips of the branches are brown and the buds all along the branches are dry and look dead. Most of the branch is still yellow in color, but I'm not sure if new buds will replace the dead ones or if I should give up on it. What are your thoughts?