Keyhole gardens combined raised bed gardening with in-situ composting in a circular design, originating in drought-prone African villages.
The Design
Keyhole shape: circular raised bed (6-8 feet diameter, 3 feet tall) with wedge-shaped path to center composting basket. The basket: wire mesh cylinder where kitchen scraps compost, feeding the surrounding bed via leaching nutrients.
Benefits: water efficiency (composting basket waters plants), nutrient recycling (scraps fertilize garden), accessibility (raised height reduces bending), and space efficiency (circular design maximizes growing area).
African Origins
Keyhole gardens developed in Lesotho and other African nations facing: poor soil, water scarcity, and limited resources. Aid organizations (Send a Cow, others) taught the technique as food security solution.
Western permaculture/sustainable agriculture communities adopted it around 2013-2014 via YouTube tutorials and mission trip reports.
Build Materials
Traditional: local stone walls, wire mesh basket, cardboard/newspaper base layer, layered soil/compost/manure fill.
Western DIY versions: cinder blocks, urbanite (recycled concrete), wood, or gabion baskets (rock-filled wire cages).
Composting Integration
The central basket: ongoing composting feeds plants. Add kitchen scraps, coffee grounds, eggshells (avoid meat/dairy/oils). Gray water (dish water, pasta water) poured into basket irrigates bed while composting.
Source
- Send a Cow: Keyhole garden programs (2005+, viral 2014)
- YouTube tutorial boom: March 2014+
- Permaculture adoption: 2014-2017