Mel Bartholomew (don’t know if I spelled that right) has a book out
called “The All New Square Foot Gardening.” In it he describes in
great detail how to build a square for garden and the benefits of
doing do. WE built ours with 4x6s. He also explains what kind of
soils you mix for “Mel’s mix” which is incredible! It is 1/3 compost,
1/3 peat moss, and 1/3 vermiculite. It took some searching to find
everything we needed but was well worth it!!!! I would encourage
anyone and everyone to take a look at it!!!
HTH
Shannon