What are the suitable humidity conditions for the growth of Gastrodia elata?

In addition to temperature, humidity is also an important factor in the growth of Gastrodia elata. The annual rainfall in Gastrodia elata-producing areas is generally above 1000 mm. In some producing areas in the southwest, rainfall is mostly around 1700 mm, and the average relative humidity is 70%-80%. The climate conditions are often continuous drizzle and rainy and humid, which are most suitable for the growth of Gastrodia elata. Therefore, in artificial cultivation of Gastrodia elata, the humidity during the growth period should be controlled at about 60%, and during the overwintering period at 30%-40%. When the temperature is high, it does not matter to Armillaria mellea, but the Gastrodia elata tubers are prone to rot; while when the humidity is low, Gastrodia elata grows slowly. Therefore, in the management process of artificial production of Gastrodia elata, measures of frequent spraying and light spraying should be taken according to the humidity conditions, and every effort should be made to adjust the humidity evenly.