Winter injury can often be prevented by constructing a barrier of burlap or similar material on the south, southwest, and windward sides of evergreens. If a plant has shown injury on all sides, surround it with a barrier, but leave the top open to allow for some air and light penetration.
Spray a thin coating of this clear liquid over the foliage to slow down the loss of water over the winter. Two applications works the best. One is applied in late fall and one in mid winter for best control.