Permaculturist Michael Pilarski talks about his first year hugelkultur diversified planting near Port Townsend, Washington. He also gives a mini-tour of the garden while in the process of mulching with "hogfuel," a 50-50 mix of bark and wood chips. Filmed June 15, 2017.
Intercropping and the Scientific Basis of Traditional Agriculture. Donald Q. Innis. Intermediate Technology Publications. 1997. 179 pages. Hundreds of references.