Mound gardening
Mound gardening
Mound gardens can be used to save space, grow root vegetables, or create a small ecosystem without irrigation or fertilization. Mound gardens have been used for quite a while; in Germany they are called hugelkultur mounds and there are variations called banana mounds in other places. In Africa they have a variation called keyhole gardens.
Making a Hugelkultur garden bed
Backyard Hugelkultur Beds To Grow Food And Sequester Carbon.
Keyhole Garden - How to make an African style raised bed.