This is an amazing way to recycle pop bottles and grow fresh vegetables in a tiny space. Check out the website with fantastic photos and a pretty clear explanation (after translating from Portuguese). I love the vertical gardening trend that has been building. You often see garden designers create elaborate vertical gardens in business venues, but not as often in the home environment. Schools could grow their own fresh greens, making it part of science studies and the kids would benefit in two ways.
This idea of using pop bottles is perfect for everyone with a sunny space. The idea is especially suited for fresh greens. They grow quickly, and require very little, other than moisture and sunlight.