Abstract: An improved mat is formed of a supporting base layer constituted at least in part by a cured biodegradable plastic reinforced by a mesh fabric, into which layer a plurality of closely spaced lengths or tufts of fibrous materials are embedded so as to extend up therefrom, the mat being produced by providing an uncured layer of that plastic material at an assembly station into which mesh fabric, preferably pre-coated with the plastic, is embedded in the plastic layer, and where thereafter the lower ends of the tufts of fibrous material are inserted lengthwise, the plastic thereafter being cured.