What temperature requirements does Gastrodia elata have for cultivation?

Temperature is an important factor affecting the growth and development of Gastrodia elata, and besides the influence of seasons, temperature is also affected by latitude and altitude. Generally speaking, for every 10° increase in latitude, the average temperature drops by 0.5°C, and for every 1000 m increase in altitude, the climate drops by about 6.5°C. Therefore, wild Gastrodia elata mostly grows in mountainous areas and has an ecological preference for cool, humid conditions. During artificial cultivation, we found that: when the temperature of the planting layer rises above 10°C, the terminal buds of Gastrodia elata begin to sprout and start to grow; when the temperature rises above 20°C, it grows rapidly; when it reaches 30°C, the growth of Gastrodia elata is inhibited; if it reaches 34°C and persists as high temperature, it will cause rotting of Gastrodia elata and reduce the yield; when the temperature of the planting layer drops below 10°C, Gastrodia elata stops growing and enters a dormant state. Gastrodia elata is relatively cold-tolerant and can overwinter safely at -3 to -4°C. When the temperature drops below -5°C, frost damage occurs in Gastrodia elata. However, in high mountainous areas where temperature changes are gentle, frost damage will not occur even if the temperature drops below -5°C. But in low mountainous areas where the range of temperature rise and fall is large, even if the planting layer is within -5°C, Gastrodia elata is often killed by frost damage. Therefore, in the process of cultivating Gastrodia elata in low mountainous areas and plains, attention must be paid to the artificial control of temperature and temperature difference.