a seed mat provides an optional lower plastic mesh layer overlain by a lower scrim layer overlain by a seed layer optionally containing biodegradable beneficiating additives overlain by a fiber layer optionally overlain by an upper scrim layer with the fiber layer or upper scrim layer , if present , overlain by an upper plastic mesh layer . the mat is formed on a conveyor by 1 ) creating the fiber layer on the conveyor ; 2 ) creating the upper scrim layer , if optioned , by placing dry cellulosic tissue over the fiber layer , wetting the tissue , applying vacuum beneath the fiber layer to consolidate the tissue on the underlying fiber layer and drying ; and 3 ) extruding an upper plastic mesh layer on the fiber layer or the upper scrim layer if present . the mat then is turned upside down on the conveyor and 4 ) the seed layer and desired additives are deposited on the then upper surface of the fourth fiber mat layer ; 5 ) the lower scrim layer of dry cellulosic tissue is placed in the same manner as the upper scrim layer ; 6 ) the lower plastic net layer , if optioned , is extruded on the surface of the scrim layer ; and 7 ) the finished mat is removed .