Are camellia hardy?
As one of the top ten famous traditional flowers in China, camellia is deeply loved by gardening enthusiasts for its elegant flower appearance and evergreen characteristics all year round. Faced with different climatic environments, cold resistance and drought tolerance have become the key to conservation. This paper will deeply analyze these two core issues from a scientific perspective. Experimental data on temperature tolerance thresholds for cold tolerance of camellia shows that mature camellia can withstand low temperatures of-10℃ briefly, but leaf margins will appear scorched after lasting for more than 48 hours. In areas north of the Yangtze River, it is recommended to move indoors above 5℃ in winter. Combined with bagging method, the thermal insulation effect of 3-5℃ can be improved. Regional adaptability differences Native species on the Yunnan-Guizhou Plateau have stronger cold tolerance than horticultural varieties. In East China, it is recommended to choose cold-resistant varieties such as 'Winter Tolerance' and 'Snow Tower'. Potting plants in the north need to pay attention to root protection, and local planting needs to be covered with soil. The three principles of water control in the camellia overwintering maintenance system implement the "dry through irrigation through" strategy in winter, and maintain the soil water content of 30%-40%. Use an electronic hygrometer to monitor, the watering time is noon and the water temperature needs to be preheated to above 8℃. Light management plan Increase flower bud differentiation rate by 40% in a full-day environment. It is recommended to use a fill light to maintain 6 hours of light per day. Pay attention to avoid direct cold air blowing, and use double-layer insulating glass for isolation. Nutrient replenishment strategy Applying potassium dihydrogen phosphate diluted by 1500 times can enhance freezing resistance, and combined with decomposed bone meal can extend flowering period by 2-3 weeks. It is recommended to apply foliar topdressing once a month, and the EC value is controlled at 0.8-1.2mS/cm. The in-depth analysis of drought tolerance of camellia shows that the critical point for drought tolerance of camellia under 40% shading environment is 21 days. During the spring and summer growing period, soil moisture needs to be maintained at 60%-70%, and using ceramsite paving can reduce water evaporation by 30%.
Through systematic temperature and humidity control and scientific maintenance, camellia can grow healthily between-5℃ and 35℃. It is recommended that growers establish a maintenance log, record data such as temperature and watering amount, and dynamically adjust the management plan based on the plant growth status to achieve the ideal effect of observing leaves in all seasons and appreciating flowers in winter.