An essential guide for biodynamic gardeners and farmers to the background to and philosophy of sprays and compost techniques. A renowned biodynamic expert, Klett provides a fascinating overview of the history of agriculture, then goes on to discuss the practicalities of spray and compost preparations and the philosophy behind them. This is essential reading for any biodynamic gardener or farmer who wants to understand the background to core biodynamic techniques. Based on keynote talks given by Manfred Klett at Biodynamic Agricultural Association conferences.