In
Permaculture Magazine, Summer 2011, there is a short article on
Sepp Holzer's advice for the landless poor (such as in the slums in Colombia). He recommends an "edible tower," which consists of a few poles put up like a tipi, with textile around them. They fill the tower with anything kind of biodegradeable that they can get, such as manure, textiles,
straw, soil,
cardboard, paper. They then put a
bucket on top, which will
water the tower in the summer. Once the
compost has settled and is not so hot it will burn the
roots of young plants, you can slit holes in the fabric and plant.