1、 Anti freezing method

1. Timely pouring frozen water: the temperature in the north is low, so it is necessary to bury soil to avoid frostbite. The frozen water should be watered 10 days before the soil is buried in order to avoid freezing its roots and prevent drought in early spring. Pay attention to water thoroughly and fully to make the soil saturated. After pouring, the soil shall be buried when the soil is slightly dry

2. Timely bury cold proof soil: after cooling in autumn, prune and bind the branches and vines in time. Because of the low temperature and strong wind in the early winter season, the water in the branches is easy to evaporate, which is unfavorable to the later winter and the growth of the next year. In addition, if the temperature remains stable at two degrees, it is necessary to bury cold proof soil. For the first time, the soil should not be too thick, as long as the branches and vines are not exposed

3. Burying the second cold proof soil: the second cold proof soil is carried out when the temperature continues to be zero. At this time, the buried soil shall be thickened, and the specific thickness shall be determined according to the temperature. If the low temperature of 80cm below the surface is minus 2 degrees, the thickness of cold proof soil should be between 20-30cm. For each degree of soil temperature reduction, the thickness of buried soil should be thickened by 10cm. And so on, so you won't get frostbite. Pay attention to the width of cold proof soil, which shall not be less than 1.2m. In addition, the root should be covered with corn straw or hay, which can improve the temperature of the root and avoid frostbite

2、 Method of burying soil

The common methods of soil burial are aboveground and underground. The method of burying soil on the ground is to press the pruned branches and vines on the ground, and then cover and seal them with soil. The underground burial method is to dig a deep ditch where the branches and vines extend, with a depth and width of about 30-50 cm, and then press the branches and vines into the ditch to cover the soil