Keyhole garden

• http://www.treehugger.com/green-food/feeding-the-world-with-rocks-raised-bed-keyhole-gardens-in-africa-video.html
• http://permaculture.org.au/2011/04/07/building-a-raised-bed-keyhole-garden/
• http://keyholefarms.com/ (Dead Link)
• http://www.sendacow.org.uk/keyhole-gardens (Original Dead Link)
  • There wasn't a snapshot on the day of the link's posting, so here are the ones on either side of that date
  • The Closest Wayback Machine Snapshot Before the Original Post's Edit Date
  • The Closest Wayback Machine Snapshot After the Original Post's Edit Date
  • This may be the modern version?