How to Prune White Fir
If any damaged branches are close to electrical wires you should not attempt to prune them, this should be done by the electric company.
A White Fir is beautiful evergreen sometimes called the Concolor Fir. Concolor is in reference to its uniform color. The 1 ½ to 2 ½ inch long needles (longest needles of the fir family) are a pale blue green color. It can grow to a height of 35 to 40 feet and a width of 15 to 30 feet. The white fir makes a wonderful specimen tree in your landscape design. This evergreen requires very little pruning. You may have to remove damaged branches on occasion or perhaps promote a new leader due to loss of the original leader of the tree. Never prune the lower branches of the white fir as this will destroy its natural form.
Prune away any damaged branches as soon as possible. Make a clean cut and do not leave a stub. Clean cuts ensure that the wound will heal properly. The tool that you use will depend upon the size and location of the branch.
Choose one leader for the tree when there are multiple leaders present. Leaders can be broken off; when a leader is broken off several leaders will begin to grow.
Cut away the other leaders. Correcting a problem of multiple leaders is the only time that you would prune a leader.