Abstract: The invention relates to a tree guard and an associated method for installation thereof for protecting cambium beneath the bark layer from mechanical damage caused by a tree support cabling system. The tree guard includes a cylindrical tube with a top wall and a bottom wall, a proximal end and a distal end sufficiently differentiated in length by a barrier ring rigidly attached on the top wall, such that the distal end be encircled and threaded through a hole at a first face of a trunk to reach a second face and the proximal end of the tube be remain out positioned about a circumference of the hole when the barrier ring anchors the tube against the trunk. The tube and the barrier ring having an inner diameter, and an outer diameter sufficiently larger to enable the cable to enter the tube and prevent the cable movement against the cambium, and not to inhibit growth of the tree respectively.