Temperature is a very important environmental condition for flower cultivation. It directly controls the growth and development of flowers and is flowering. Each flower has a maximum survival temperature. Above this temperature, it may cause flower burns or death. 1, the danger of high temperature. Excessive temperatures are detrimental to flower growth. When outside temperatures approach the upper limit of flower survival, the plants will grow poorly, develop slowly, and may even die within a short period of time; investigate the causes. 1 High temperature increases flower respiration and weakens photosynthesis. The imbalance between nutrient accumulation and consumption is degraded. Plants do not receive adequate nutrition and stunted or even stop growing. Ultrahigh temperature above 245°C can make floral cells intracellular. The protein coagulates due to heat and causes the death of the plant; 3 the high temperature will cause the leaves of the foliage plants to retreat green, shorten the flowering period of the flower of the flower of the concept, or cause the petals to become anxious; 4 the pests and insects have frequent activities under high temperature and the damage to the flowers is also serious. 2, high temperature prevention. The prevention of high-temperature hazards of flowers should first be based on different climatic conditions, selecting different types and varieties of flowers, and adapting to local conditions and planting flowers appropriately; before planting flowers, it is necessary to consider whether the species of flowers can be safely maintained in the local area. Choose a strong, high temperature resistant variety. According to many years of practice, the "Four Characters" to prevent high temperatures in flowers and trees are briefly described below. One is "hidden." That is, shading and anti-glare, high temperature and strong light almost always appear at the same time; therefore, shaded light can effectively reduce the temperature; for flowers that are afraid of high temperature and are afraid of light, such as bells, cyclamen, orchids, etc. In the high temperature season in summer, proper shading or curing under shade can provide the necessary cool environment for the normal growth of summer and high temperature. If you don't have a arbor or shade, you can also use the shade during the day to cool down in the room and move to the open air for ventilation at night. The second is "sprinkling." In other words, watering, humidifying, and cooling reduce the temperature in the high summer season. Watering and spraying the leaves around the site where the potted plants are placed can increase the humidity and reduce the temperature, reduce the leaf surface evaporation, and increase the ability of the flowers to resist drought. The flowers create a cool, moist and fine environment; according to practical observations, the ground temperature can be immediately lowered by 1 to 5°C after spraying, and the temperature of the leaf surface can be lowered by 1 to 2°C for a few minutes after spraying; when it is sprinkled, it must not be at a hot noon. Or pour cold water on pots that have already begun to wilt, otherwise it will easily cause "cold" and accelerate its wilting or death. The third is "to avoid." That is to avoid rain and rot, summer rain is more and more, and long duration; sudden cooling caused by rainfall, easy to damage the root hair, water accumulation in the basin after the rain, so that the respiration of the root is blocked, easy to cause rot root, fleshy root flowers Rotten roots are more severe; therefore, flowers that are in a weak or semi-dormant state in midsummer should be placed in a sheltered place. Even flowers in open fields should be properly covered. The accumulated water after rain should be promptly removed to prevent rot. The fourth is "pass." That is, ventilation, air cooling, flower breathing and photosynthesis all must have sufficient fresh air; poor ventilation will hinder the respiratory function, affect the normal growth of flowers, and even cause the gradual death of flowers; summer rain, high temperature, poor ventilation When the temperature is easy to rise, the pest and disease activity is strengthened, and the safety is often severely affected. The solution is to strengthen the ventilation of the breeding site, continuously replace and supply fresh air, reduce the temperature and humidity, and reduce the concentration of harmful and toxic gases. It is also necessary to appropriately reduce the planting density of flowers and trees in open fields or flowerbeds, carry out reasonable plastic trimming, and control the leggy of certain flowers and trees.