Dendrobium is mostly wild in a cool and humid environment, and often grows on trees and rocks in a cool and humid forest, especially on limestone and trees with bryophytes in semi-shady and semi-sunny places. In the southwest, it is mostly cultivated in the low mountain area with an altitude of 3 ~ 1 meters, in the areas where the annual precipitation is more than 1 mm, the relative humidity is 8% ~ 85%, and the annual average temperature is above 17℃. For example, Hejiang County, Sichuan Province is the main producing area of Dendrobium, located at 28 49' north latitude and 15 5' east longitude, with an altitude of 283 meters, an average temperature of 18.2℃, an average maximum temperature of 21.9℃, an average minimum temperature of 15.3℃, an extreme maximum temperature of 4.7℃, an extreme minimum temperature of -1.2℃ and an annual precipitation of 1,184.2 mm. Dendrobium has been cultivated in this county for a long time.