The product is called an EcoWall living wall panel. It's a hydroponic panel so we plant in a series of inorganic media that is fed via an internal irrigation system. We've basically eliminated the need for soil in our living wall product. Feel free to check out www.greenecowalls.com for more information.

I've seen these done as a do-it-yourself project using a lightweight plastic base with drain holes for the bottom, a piece of lattice work installed on the top (dirt in the plastic bottom, lattice on top, plants are then inserted into the spaces created by lattice.