Does Gastrodia elata in Changbai Mountain of Jilin Province suffer frost damage in the snow year? How to prevent frost damage

The wild Gastrodia elata in Changbai Mountain of Jilin Province is mainly distributed in the alpine broad-leaved mixed forest with cool and humid summer, deep snow in winter, large ground coverage, thick litter layer, shallow frozen layer, 500-2500m above sea level and loose soil.

Wild Gastrodia elata has less snow and thick frozen layer in winter, and artificial cultivation of Gastrodia elata has freezing injury at the time of cold prevention measures. The ground was sealed by heavy snow in 1981 and 1982, and the snow thickness was 80 cm in winter. It was found that the frozen layer on the ground was only 3 cm after breaking the snow, so there was no freezing injury in wild Gastrodia elata and Gastrodia elata. People call it the "bumper harvest year of Gastrodia elata". In the late autumn of 1983, after several consecutive moderate rain and snow, followed by severe freezing, and less snow in early winter, the snow layer was only 15 cm thick, the snow was found to be 70 cm thick, and the ground was exposed in different places, and the frozen layer reached 180 cm. As a result, Gastrodia elata suffered frost damage. People call it the year of poor harvest of Gastrodia elata. Note: "bumper harvest year and poor harvest year" is for wild Gastrodia elata.

So how to prevent the freezing injury of Gastrodia elata?

Gastrodia elata was planted in ① cellar. In order to protect Gastrodia elata from frost injury, Armillaria mellea was cultured in fixed bacterial bed from August to September in the first year of planting. Gastrodia elata was planted and used to survive the winter indoors. After thawing in early spring of the second year, large and medium white flax were cultivated in fixed bacterial bed. Autumn harvest can avoid frost injury and obtain ideal yield of Gastrodia elata.

② should plant Gastrodia elata in the cellar of high and cold area at the right time and early. Generally try to plant hemp at the end of September and the beginning of October. This can fully combine Gastrodia elata with soil, connect Armillaria mellea in advance, and enhance the cold resistance of Gastrodia elata.

③ cellar planting Gastrodia elata in autumn, Gastrodia elata should be selected strictly. Xiaobai hemp and rice hemp with strong vitality were selected for cultivation.

The overwintering humidity of Gastrodia elata planted in ④ cellar should be kept at 30%. When planting Gastrodia elata in a large area, cover with felt paper or plastic film to prevent Rain Water, and clean up the drainage ditch to prevent stagnant water from invading the cellar, resulting in excessive humidity in the cellar, causing rotten hemp and freezing injury.

⑤ adds cold protection measures and thickens the cold protection layer. If you use soil to protect against cold, you should first cover 15 centimeters of fallen leaves, and then cover 15 to 20 centimeters of cold soil. Those without fallen leaves can be covered with double-layer felt paper or plastic film on Gastrodia elata cellar instead of fallen leaves. In addition, where there are conditions, only 15 cm thick dry sawdust can be covered to achieve the purpose of cold protection.