What to do with yellow and fallen leaves of bougainvillea in autumn
In late autumn, bougainvillea collectively staged a "fallen leaf show", and the yellowing and peeling of the leaves made countless flower friends worried. This is not only a survival warning for plants, but also a clear signal that conservation methods need to be adjusted. This article will use five core solutions to take you to crack the autumn maintenance password of bougainvillea. 1. Temperature control techniques for three elements of environmental control The temperature difference between day and night in the northern region can reach more than 15℃. When the night temperature falls below 10℃, frostbite macula begins to appear on the leaves of Bougainvillea. It is recommended to use an electronic thermometer for real-time monitoring. When maintaining the balcony, a combination of double glass + insulation cotton can be used to protect the ambient temperature stable within the range of 12-25℃. Experimental data from the light optimization plan show that direct light energy of more than 4 hours per day increases the photosynthetic efficiency of Bougainvillea by 60%. It is recommended to make a lighting schedule, place the plants on the south-facing window sill, and use reflectors to increase scattered light. If it has been raining continuously for more than 3 days, it is recommended that the fill light replenish the light for 2-3 hours every day. 2. Two key points for precise maintenance Scientific watering formula The amount of watering in autumn should follow the rule of "temperature ×0.8": when the temperature is 20℃, 160ml (20×0.8×10cm pot diameter) are watered each time. Using finger testing method-watering the soil at the second knuckle when it is dry, and combining with ceramsite paving to enhance air permeability can effectively prevent water accumulation and root rot. Nutrient replenishment strategy: High-phosphorus potassium fertilizer (N-P-K=5-15-10) should be used from September to November, with foliar spraying twice a month + root irrigation once. Special addition of iron chelate fertilizer can improve the yellow leaves. It is recommended to control the concentration at 800-1000 times the liquid, and use it with EM bacterial agent to improve the fertilizer utilization rate. 3. When special problem handling is found when pests and diseases such as red spider are discovered, a 75% alcohol cotton sheet can be used to wipe the back of the leaves. For severely yellow-leafed plants, a "three-step recovery method" is recommended: pruning 1/3 of the branches → replacing plain sand → bagging to moisturize. New buds can usually germinate in 2 weeks.
Through the five-dimensional maintenance system of temperature, light, moisture, nutrition, pests and diseases, and regular observation and recording, bougainvillea can maintain more than 85% leaf integrity rate in autumn. It is recommended to conduct maintenance inspections every weekend and establish plant health files, so that every yellow leaf becomes an opportunity to optimize maintenance plans.