Keyhole gardening is a method developed for areas experiencing severe drought and limited resources, specifically Africa. However, the concept is just as useful in other parts of the world and in your backyard. Keyhole gardens conserve water, and they provide plants with easy access to nutrients.
Keyhole gardens are a variation on raised bed gardening. Keyhole gardens are round raised beds that feature a notch in one side that provides access to a composting tower, or basket, in the middle. As compostable materials and water are added to the center of a keyhole garden, the water and nutrients spread out within the keyhole garden to feed and irrigate your plants. The loose, nutrient-rich soil makes it easy to grow edibles in even the worst conditions.
How to build a keyhole garden
Keyhole gardens are easily made with curb-scored old bricks, stones, or cinderblocks. You can also use landscape cloth, wood planks or branches, wine bottles, old fencing panels, corrugated metal sheets - really, you can use anything that isn’t toxic. Use your imagination! Follow these steps to create your very own keyhole garden:
Sources of compostable materials
Most people know that yard and kitchen waste are compostable, but there are many other sources of perfectly acceptable materials for the basket of your keyhole garden or any compost pile. Remember that compostables are designated as “browns” or “greens” and that you should aim for a 50:50 mix of the two. Some interesting source of “green” compostables include coffee grounds and tea bags, often available for free from coffee shops, and fresh manure from local barns. [Manure from veterinary clinics is not recommended.] We throw away a profound amount of compostable “brown” material. Some sources you may not have considered include any paper or wood products (simply avoid the colored, slick, or waxed varieties), dryer lint, vacuum cleaner waste, unwaxed cardboard, and even clothing made from 100% natural fibers. Rather than adding these materials to local landfills, you can transform them into plant or worm food in your compost pile, worm farm, or in the central basket of your keyhole garden.
You can grow a surprising amount of food in your own yard. Ask me how!