Chances are you've seen vertical gardens (also known as: living walls, or green walls). They can be found indoors or out, and are a great way to utilize, often unused, space. You can grow almost anything in a vertical garden: perennials, annuals, moss, ivy, herbs, etc. The containers used are also abundant. They can be freestanding or attached to a wall or fence creating endless options. Vertical gardens not only make great use of space, but they also help cool buildings and save water. Done well, these gardens are also a beautiful work of art. Here are a few vertical gardens for your inspiration.