Healthy Soil, Healthy Vines, Tasty Wines A year in a Biodynamic® Vineyard     So, you have to bury cow’s horns filled with fermented cow dung preferably from a lactating cow (BD 500), 18 inches below the surface during the cooler months. And sure, you have to bury finely ground quartz crystals (BD 501) in the cow’s horns during the hot time of the year to prepare the soil. But not to worry, there ...