Biodynamy is a concept of organic agriculture based on principles defined by the Austrian PhilosopherRudolph Steiner, part of his wider system of "Anthroposophy", or spiritual science. A farm, or a vineyard, is seen as a living system whose functioning is explained in terms of 'formative' forces. If something is wrong, it is because these forces are out of balance. There might be too much 'astrality', for example, and not enough 'etheric' force.
Even the most distant movements of the stars are connected to the smallest operations of the land. Lay-lines must be taken into account. The weakness of conventional science, in biodynamic terms, is its obsession with analysing physical effects, and ignorance of the forces that underlie them. Steiner was well aware that this would appear 'insane' to many people.