Have you ever heard of a garden that waters and fertilizes itself? We certainly had never heard of such a thing until last week when we stumbled across a short video showing women in Africa building a "keyhole garden."
Keyhole garden. Designed for arid environments with poor soil, it's a raised bed system with a built in compost basket. Self fertilizing, and super efficient at holding in moisture. Can be built in a day. Uses 1 gallon of water a day.: