Abstract: A vegetation barrier for the prevention of vegetation growth directly beneath and immediately around a fence. The barrier employs one or more barrier segments receivable beneath the lower edge of a fence. Each segment includes a first aperture disposed near one of its two longitudinal ends, and a second aperture disposed near the opposite longitudinal end of the segment. The apertures have different widths in the transverse direction, such that the segments are adapted to be used with fences constructed with posts having either of two sizes, such as the standardized sizes of about 15/8 inches and about 21/2 inches used in residential and commercial fence constructions. Multiple barrier segments can be installed on fences with differing spacing between posts by adjusting the amount of overlap between members.