Big box home improvement store, Lowe's, gets hands-on and shares with us a how-to on making a trellis moss garden. The vertical garden uses moss and drought-tolerant succulents, requiring only an occasional light watering with a spray bottle...

The only thing we would do differently is we wouldn't use a trellis off-the-shelf. We'd make a much simpler rectangular frame for the backing. One commenter on the Lowe's page even suggests repurposing an old twin bed spring, which would work just fine for our simple rectangular appearance. We'd follow the directions from there: Trellis Moss Garden from Lowe's Idea Library.