Overview A very water, nutrient and space efficient concept. The keyhole garden is easy to construct. A cylinder of wire mesh is put in the middle of a keyhole-shaped wall made from bricks, stones or glass or plastic bottles. Topsoil or compost (See the composter) is then is added and plants can be planted as shown. Organic material is added to the centre inside the mesh. This retains water and nutrients that can pass through to feed the plants. The keyhole shape allows the organic material to be added easily. Design Task You are to create the most efficient keyhole garden Some questions you may want to think about:
- What is the most efficient size to build?
- How deep should the soil be?
- How big should the cylinder be?
- What is the best way to stack the compost?