Keyhole Gardens

From Africa to Valhalla: a keyhole garden
http://www.valhalla-project.com/2012/01/from-africa-to-valhalla-keyhole-garden.html

 Have you ever heard of a garden that waters and fertilizes itself? We certainly had never heard of such a thing until last week when we stumbled across a short video showing women in Africa building a "keyhole garden."

The concept is incredibly simple, and the keyhole raised bed in the video looked very easy to construct with hardly any tools and only very inexpensive materials. Take a look for yourselves:   ---CONTINUED---

Keyhole Gardens vs. Row Gardens
https://thegrownetwork.com/keyhole-gardens-vs-row-gardens/

Keyhole gardens are cool. (SNIP) ...

I mean, it’s really cool and all that—but the labor involved! Holy moly. You could plant a quarter acre of row gardens with that amount of labor in the same amount of time. . . . ---CONTINUED---