Dendrobium candidum is a valuable Chinese herbal medicine. It is a perennial herb with tufted stems, cylindrical shape, height of 10-30 cm and thickness of 3-8 mm. It is known as the "giant panda" in the medicine field among the people. There are more than 70 kinds in China, including several varieties in the Pharmacopoeia, such as iron maple bucket, ring grass maple bucket, yellow grass maple bucket, golden hairpin maple bucket, whip maple bucket and so on. Among them, the iron maple bucket is the best in the maple bucket, named after its iron green skin. Dendrobium nobile is a plant of Dendrobium of Orchidaceae, distributed in Australia. The fragrance is between fresh and pungent, and it is the kind of flavor with alternating shades, which seems to be full of passion, pride and intensity in the cold. Small and elegant flowers exude a strong fragrance in the sun. Generally attached to rocks in the wild, cold-resistant. As long as the climate is suitable, its requirements for nutrients are not high.