Cut off loose, ragged pieces of bark that surround a tree wound such as a broken branch. Whittle away the injured bark, taking care to avoid stripping away healthy, living bark. If the tree wound appears in the early spring during a period of new growth, leave the bark as is to reduce interference with the tree's own healing system.
Remove dead and broken branches to heal tree wounds. Use a saw to make a clean cut in the wood. Branches that grow flush against the trunk can be cut with the exposed end flush, without leaving a stump. Branches that contain a collar, or area of swelling near the trunk, should be left with a small existing stub.
Water, mulch and fertilize a wounded tree just as you would a healthy tree. Specifics in fertilizing vary depending on the type of tree. Watering is only necessary during a period of drought. Keep the injured tree as healthy as possible to deliver essential nutrients to the root system as it heals.