Hibai is a term that refers to the artificial replenishment of nutrition in plants, especially in hydroponic systems. It is derived from the Japanese word for "fertilizer", and it involves applying a mixture of organic and inorganic substances to the soil or the roots of the plants. Hibai can enhance the growth, health, and appearance of plants and bonsai by providing them with essential nutrients and minerals. Hibai can also help prevent or treat diseases, pests, and environmental stress in plants and bonsai. Hibai is usually done periodically, depending on the type, size, and condition of the plants and bonsai.