A vegetation barrier for use beneath a fence to inhibit the growth of vegetation beneath said fence includes two vegetation barrier members and an intermediate member. Each vegetation barrier member is joinable to a fence post at one end and engages an intermediate member at the opposite end through longitudinally slidable engagement, allowing the vegetation barrier to readily accommodate uneven spacing between fence posts and further allowing the vegetation barrier to expand and contract. The vegetation barrier member and/or the intermediate member may further comprise elongated openings that allow the vegetation barrier to be secured to an underlying surface by a securement member that passes through the elongated opening and into the underlying surface, while still allowing for expansion and contraction of the vegetation barrier. Further provided are methods of covering a surface beneath a fence using said vegetation barrier.