The necessary conditions for Gastrodia and Armillaria are mainly temperature. It can grow and grow normally at 2～28°C. How to control this condition is the most important one for the success of Gastrodia production. The temperature throughout the country can be roughly divided into three types:
(1) Heilongjiang, Jilin, Liaoning, Inner Mongolia, Qinghai and Xinjiang. These regions must ensure that the winter will not freeze the seedlings. In the summer, it is not necessary to consider the effect of high temperatures on the growth of Tianma. The best solution is to plant Tianma indoors and warm it slightly in winter. Outdoor species of Gastrodia is mainly covered with cold-proof materials, or spring harvest.
(2) Shandong, Hebei, Shanxi, Shaanxi, Hubei, Anhui, Jiangsu, and Henan. In addition to anti-freeze, these areas need to prevent heatstroke. The best solution is to plant in a well-ventilated room and spray water to cool down in the summer. The factory produces air-conditioning or ice cubes that can be used for cooling; it can be kept indoors at 2°C in winter.
(3) Hunan, Zhejiang, Fujian, Jiangxi, Guangdong, Guangxi, Sichuan, and other places, mainly considering how to reduce the temperature, should make full use of air-raid shelters, caves, and high mountain jungles, and use air-conditioners for factory production. In short, we must try to make the indoor temperature not exceed 28°C during the summer and it is better not to freeze in the winter.
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