Double digging is a method of loosening the soil to allow for freer root growth, higher aeration and good drainage. It is used in many raised bed techniques of gardening. The soil is loosened in two layers, and sometimes organic material is added.

First the top layer is dug off with a spade, forming a shallow trench usually around 12 inches deep, and then the under-layer (at the bottom of the trench) is dug with a fork another 12 inches. Once this is done, organic matter may be added to the soil.

A second trench is then started, backfilling the first trench. This process is repeated until the whole bed has been treated. There will be soil left over from the first trench, which is used to fill the last trench.

Help build the World Food Garden Wiki by sharing your knowledge with other gardeners.

Have you found a good way to deal with a destructive garden pest?
What soil ammendments work best in your area?
What varieties are best suited to your area?
...there are thousands of other questions that need answers too.