Greenhouses, as facilities used during winter, must possess a variety of functions to meet our environmental requirements, especially during heavy snowstorms, which test the wind and snow resistance of the greenhouses. Over the years, people have progressively improved the structure of greenhouses, transitioning from thin bamboo poles to concrete supports and now to steel frameworks. This gradual change has led to the current greenhouses being very sturdy. However, during particularly severe snowstorms, it is necessary to reinforce old greenhouses by adding pillars and making timely repairs to enhance their load-bearing capacity. Additionally, snow removal should be done promptly, with special attention given to night-time snow removal to prevent heavy snowfall from collapsing the greenhouse and causing losses. Moreover, the following measures should be taken for the maintenance of greenhouses:

1. Prepare for supplementary lighting and insulation: Prior to snowfall, ensure that items such as straw mats, cotton blankets, and temporary heating and lighting aids like heaters and supplementary lights are ready. This ensures that when the temperature inside the greenhouse or large greenhouse drops to the required low temperature and light levels for vegetable production, timely measures for temperature increase, insulation, and lighting supplementation can be taken.

2. Proper Use of Covers: During daytime snowfall, it's advisable to uncover straw mats and other covers to benefit from diffused light for maintaining the temperature inside the greenhouse and to facilitate photosynthesis. It also helps in removing snow from the greenhouse roof. At night, when snowing, an additional layer of plastic film should be placed over the cotton blankets and straw mats, not only for easier snow removal but also to prevent the covers of the greenhouse from getting wet.

3. It is important to note the environmental control in greenhouses after a snowfall: During extended periods of snow, it may be impossible to uncover the grass mats or cotton blankets for several days, especially after a heavy snowfall followed by a sudden sunny spell. If one rushes to fully uncover the greenhouse coverings, the temperature can rise rapidly, causing the indoor air humidity to drop quickly, leading to rapid transpiration in the leaves. Meanwhile, the ground temperature remains low, weakening root activity and reducing absorption capacity, which can easily result in physiological water imbalance in the leaves, leading to wilting of the plants and even death. It is advisable to ventilate the greenhouse promptly after the weather clears, but the ventilation openings should not be too large to prevent sudden temperature changes from affecting the plants. Additionally, gradually increase the time and amount of uncovering the coverings until the plants no longer wilt, then transition to normal management. After uncovering the coverings, if vegetables show signs of wilting, cover them immediately and uncover them once the leaves have recovered, repeating this process until wilting stops. Farmers without rolling curtains can alternate uncovering the grass mats to prevent excessive temperature rise and simultaneously alternate in heating the ground to raise the ground temperature. If seedlings wilt, spray them with clear water or a 1% glucose solution on the wilted seedlings to quickly restore growth.