I first read about keyhole gardening in the February 2012 issue of Texas Co-Op Power magazine. In the article - written by G.Elaine Acker with photos by Bill Smith - Deb Tolman describes a interesting method for producing food even during times of drought. Here's a page from the article which shows a diagram and some simple steps for getting started. For the full article visit, Keyhole Gardening.
The idea of a keyhole garden, so named for it's interesting keyhole shape, is to produce food using minimal water and maximum recycling. What a great concept!
The basic structure of a keyhole garden consists of a 6 foot circle of rock stacked 3 feet high. The structure is filled with layers of cardboard, phone books, or recycled paper. Soil is added to the top few inches for planting.
A small notch is cut out of the circle to allow access to a 4 foot tall wire mesh tube that sits in middle. Compostable materials and water are fed into the tube to provide moisture and nutrients to the garden.
While I was contemplating where I could build one of these, this keyhole garden, deep in the heart of the Texas Hill Country, was already growing cucumbers. Complete with it's deer proof fencing, this garden is sure to provide food for years to come. Well done!