When a tree has a split trunk or codominant stems, it may be wise to brace the tree with strong metal supports. Much like a bolt connecting the two pieces of the tree, these metal supports help the tree stay strong, and the tree is able to grow around the metal. However, if your tree species has trouble compartmentalizing wounds, another method may be preferable.
Cabling is a method of reinforcing a tree using wires in the canopy. Cabling can be done in a variety of ways depending on what kind of damage you need to prevent. Sturdy steel cables, or shock absorbing synthetic cables, are used to link one limb to another. These can either be rigged to prevent movement from wind, or allow controlled movement.
Pruning a tree removes weak, injured, and damaged tree limbs. It can also strategically shape and thin a canopy, allowing for more air flow and less wind resistance. These techniques reduce stress and wear and tear on your tree and the stems. Canopy thinning, directional pruning, and deadwooding all improve the look and health of your trees.