How We Built Our Hügelkultur Keyhole Garden
Keyhole Gardens are large circular raised beds about 6 feet across that usually have a stone wall, rather like an old fashioned well, that runs about 3 feet high. A small notch in the circle (the keyhole) is cut into one side so that the gardener can reach the composting basket at its center. The basket runs all the way down to the base of the garden; scraps and other compostable materials can be dropped directly in. This feeds the raised bed continually, thus saving the gardener space and time.