A universal fit flexible tree trunk guard fabricated from a medium to high density silicone rubber material for protecting the trunk of a tree or an ornamental shrub from strikes from lawn care equipment or from interactions with wildlife. A plurality of hole members are provided along the upper and lower edges of the trunk guard. This rectangular sheet can then be wrapped around the trunk, the diameter of the thus-formed cylinder adjusted to fit the tree or ornamental shrub to be protected. Mechanical fastening means can then be used, at registering hole members, to secure the trunk guard in a cylindrical form. Additionally, the interior surface, i.e. the surface that is facing the trunk of the tree or ornamental shrub, can be provided with a plurality of spaced bosses that maintain an air space between the surface of the tree trunk and the trunk guard.
