- Stand Alone Vertical Green Wall is a cost saving alternative to fences and screen walls.The Vertical Garden Freestanding Green Wall System brings life to your surroundings. It’s just waiting for a gardener’s touch. Whether you decide to place this beautiful screen indoors or outdoors, you’re sure to love it. It supports twenty natural terracotta pots, charcoal pots or white pots. Also available in a choice of charcoal or white frames with matching river stones.