Bracing and cabling are effective methods of preserving and strengthening a potentially weak or hazardous tree. Bolting is a method used to strengthen a weak or splitting crotch or union usually in the trunk of a tree. Cabling is used to support heavy limbs and to prevent limb failure under unfavorable weather conditions. Cables are installed high in the tree, at least 2/3 the distance from the defect to the crown. Rods are installed much lower, just above and/or below the defect. Cables are always stronger than rods because of their greater leverage. Cables can be used alone, but bracing is always supplemented with cables Bolting/cabling does not harm tree.