The pure and applied science that is concerned with botany and management of crop and ornamental plants for utilization by humankind. Crop plants include those grown and used directly for food, feed, or fiber, such as cereal grains, soybeans, citrus, and cotton; those converted biologically to products of utility, such as forage plants, hops, and mulberry; and those used for medicinal or special products, such as digitalis, opium poppy, coffee, and cinnamon. In addition, many plant products such as crambe oil and rubber are used in industry where synthetic products have not been satisfactory. Ornamental plants are cultured for their esthetic value.