Wood Prairie Farm Organic Fertilizer. If you are blessed with very rich organic garden soil, you may be able to skip buying organic fertilizer. But the fact is, for the bst quality and yield most gardens need a helping hand. Our organic fertilizers are made from approved materials on the USDA National Organic list, and we use them here on Wood Prairie Farm. Three lbs will cover 100 square feet or 35 feet of row. Available in 3 and 30 pound bags. Discount begins at 3 and 5 3lb. bag orders.