USDA. Agricultural Research Service.
USDA. NAL. Alternative Farming Systems Information Center.
Lists alternative field crops, specialty and ethnic vegetables, fruits and nuts, horticulture/nursery crops, and agroforestry/forestry products.
University of California. Department of Plant Sciences.
Covers insects and diseases, irrigation and nutrition, organic production, pesticides and alternatives, weather, soil, and more. Identifies research-based information about extension activities in planting, growing and harvesting fruits and nuts.