biodynamics!

"Spring is good for us," he continues. "For a vine, spring is the victory of the sun forces over earth forces. In autumn, the law of death comes into force-- the law of gravitation comes into force and the leaves begin falling. Look how tired we get in the evening. On the first day of spring the days are a bit longer than the nights. The sun attraction is stronger than gravitation." (N. Joly, Science of Wine, Jamie Goode, 70)