Every agricultural enterprise is a selfcontained biological unit. Ehrenfried Pfeiffer There have been numerous developments and advancements in biodynamic agricultural methods since Ehrenfried Pfeiffer introduced North Americans to the foundational principles and practices of biodynamics the basics of which continue to be used today. Thus although Biodynamic Farming and Gardening was first published in 1938 it remains a foundational text for anyone who is or plans to become a serious biodynam