- Jul 15, 2014
- Reaction score
The structure of the keyhole gardens is to create a circular compost pile. Around the compost, soil is to be surrounded in a U shape built up using stacked rocks or another barrier to hold the soil around the compost. As rain falls through the compost, the nitrogen and other minerals from the compost will be slowly released like a liquid fertilizer into the soil.
The first step in making a keyhole garden is either making the cylindrical compost hole with mesh, wire, or some kind of fencing.
Secondly, make the outer frame with bricks, rocks, wood, or other materials to contain the soil. Shape the frame like a U so that you can walk in the space.
Third, lay down cardboard at the bottom of the garden to suppress weeds.
Fourth, begin by adding soil in the garden, and fill the compost cage with food scraps.
Below are examples of the many ways gardeners have made keyhole gardens.
university of bristol
Original post @ Keyhole Gardens (how to & design)