A double-sided root barrier has an inside channel formed on an inside surface. The inside channel is formed between the inside channel inside surface and the transition area inside surface. The transition area inside surface is formed at an angle to an outside channel inside surface. The outside channel inside surface is formed at an angle to the inside surface. An outside channel is formed on an outside surface, and the outside channel is formed between an outside channel outside surface and a transition area outside surface. The transition area outside surface is parallel to the transition area inside surface. The outside channel outside surface is parallel to the outside channel inside surface, and the transition area outside surface is formed at an angle to the inside channel outside surface.
