In practice, soil, plants, animals and humans together create this image of a holistic living organism. On- farm recycling improves the individualizing character of the farm and includes the integration of animals and animal feeds, perennial plants, flowers and trees, water features, and composting. Farms reduce dependence on imported materials for fertility and pest control. Water conservation is emphasized. Specially prepared medicinal plants, minerals, and composted animal manures help increase the vitality of the products grown and further anchor each individual farm in time and place. Biodynamic farms are required to maintain at least 10 percent of total acreage as a biodiversity set-aside. Riparian zones, wetlands, grasslands, and forests: all are considered an integral part of the life of the farm.