There are two classifications to green facades: direct and indirect. Direct green facades are attached to the wall while indirect green facades incorporates a structure that will support it for plants. Indirect green facades include two different solutions: continuous and modular. Modular and continuous systems secure the living wall and further protect so it can hold itself from the changing weather. Modular green facades have vessels for rooting plants and come in forms such as trays, vessels, planter tiles, or flexible bags.