What are the technical measures for protecting flowers and nursery stock against snow and freezing?

 In order to reduce the impact of heavy snow and strong cold air on flower and nursery stock production in our city, and to minimize losses from snow damage and freezing damage, all production units and flower growers should focus on the following three aspects of work: 1. Greenhouse management: do a good job of reinforcing greenhouses and removing accumulated snow. Clear snow from greenhouse roofs to increase light transmission, effectively prevent accumulated snow from crushing the greenhouses, and at the same time reduce the freezing low temperatures produced after the snow melts. When clearing snow, scrape and push gently to avoid puncturing the greenhouse film, and move the scraped snow out of the nursery area. Greenhouses that have been crushed or have collapsed and deformed should be reinforced and repaired immediately. For those that cannot be repaired, the plants inside should be moved promptly, or film, straw curtains or shade netting should be added to improve insulation. Do a good job of freeze protection after snow. Freezing weather will occur after snow, so an inner film should be added inside all types of greenhouses to form a double-layer inner and outer film for insulation, and where conditions permit, heating should be provided inside the greenhouse. 2. Management of open-field flowers and trees: after snow, personnel should be organized to promptly shake off the accumulated snow from the flowers and trees. When shaking off snow, hook the branches securely, shake gently first, then gradually increase the force, and simply shake the accumulated snow off the leaves. After the snow melts, soil should be banked up around the roots to increase ground temperature. Where conditions permit, measures such as covering, bundling with grass, and smoking may be adopted to reduce freezing damage. At the same time, clear ditches and drain water around the nursery should also be carried out to reduce soil moisture in the field, avoid accumulated snowmelt water in the nursery area, and prevent freezing damage and waterlogging damage from occurring at the same time and freezing the root system. 3. Recovery measures after freezing damage: after plants suffer freezing damage, cultivation management should be strengthened to restore growth vigor. 1. Drain water promptly after freezing, which can ease the effects of freezing damage and reduce losses. For heavily frozen flowers and trees, after budding, even more attention should be paid to soil moisture management; both excessive waterlogging and excessive drought are unfavorable for the recovery of plant growth. 2. Carry out banking up of soil and inter-row covering. After the snow melts, new soil can be banked up around the plants, and firewood, straw, turf, leaves, sawdust, manure, rice and wheat husks, and rice straw can be used to spread over the seedbed before the soil freezes, so as to increase the soil's heat preservation effect. 3. According to the degree of freezing damage, treat the tree canopy reasonably. If after freezing the twigs are still in good condition but the leaves are withered and do not fall, they should be removed promptly. Pruning of frozen and dried twigs should be carried out after budding, keeping the healthy parts and cutting off the dead parts; pruning should not be done too early, otherwise the wounds are susceptible to disease infection. 4. For plants that suffer relatively light freezing damage, with leaf curling, yellowing leaves, and weakened growth, 0.5% urea can be used for 2-3 foliar topdressings. After thawing in early spring, apply sufficient spring fertilizer early to restore their growth vigor. For plants with severe freezing damage, it is advisable to apply thin fertilizer frequently, and special attention should be paid to controlling the timing of fertilization, with the aim of promoting spring and summer shoots while controlling autumn shoots. In addition, after freezing, flowers and trees have weaker growth vigor and are often prone to pests and diseases, so inspections must be carried out frequently and pest and disease prevention work must be done well.