Worms can eat up to 75% of their own body weight every day, turning waste into rich and fertile compost. What a great project for the kids to help with.. use the compost to grow your own organic vegetables!
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.