The mouldboard plow was the primary tool of the post-Roman farmer
The plow was made primarily of wood, with an iron blade as the tilling implement. The metal was not thick, and the design was light, so that it was unable to turn over fresh soil.
The majority of farmers throughout the island used exactly the same implements. The free British, the British under Germanic and Irish rule, and the Picts were all using the same lesser Roman design.