Sitting walls and retaining walls serve many different purposes in the landscape. The most common task of a wall is to expand the site's usable space. Sitting walls (two sided, free standing walls) can add to the sitting spots on your patio without the need of cluttering the patio with tables and chairs during larger gatherings. Sitting walls also add a vertical element to the space and are an excellent spot for flower and herb pots to be displayed! When installing a sitting wall on the outside of a patio edge, try locating a flower or rose bed behind the wall as it can add additional color to your space with the flowers rising from behind the wall.