Again, spring is upon us and we need to start thinking more about our outdoor spaces. If you're anything like us, you have limited space in which to exercise your green thumb. Fern, from "Life on the Balcony" has provided us with a great/cheap idea for creating some additional green space. What's best, is that it is using wasted vertical space along an outdoor wall. Follow the jump for more pics, and hit the link for a step by step how-to guide, as well as a list of plants that would do well in this setting.