What should I do if the hydrangea leaves are yellow and the edges are dry?
Hydrangea is one of the three treasures of the courtyard, and its huge flower ball can always attract many attention. However, when the leaves appear yellowed and dry, it not only affects the ornamental value, but may also threaten the health of the plant. This article will analyze the causes of yellow leaves from three key dimensions and provide targeted solutions. Soil moisture, a key factor in water management, accurately controls hydrangea flowers. The characteristics of being "thirsty and waterlogged" are particularly obvious. The root system will produce a suffocation reaction when water is accumulated for more than 12 hours, which is manifested by yellowing and curling leaf tips. It is recommended to use the bamboo stick detection method: insert a 30-cm bamboo stick into the basin soil, pull it out to observe moisture traces, and maintain the micro-tidal state of the middle soil. Watering time and method Choose 6-8 a.m. in summer and noon in winter. The dipping basin method and foliar spray can make water penetrate evenly. Special reminder: Reduce the frequency of water spraying during flowering to avoid residual water droplets causing gray mold. Scientific plan for nutrient supply fertilizer ratio cycle table Apply water-soluble fertilizer with a ratio of 20-20-20-20-20 during the growth period (March to June), once every 10 days; use high-phosphorus formula (10-30-10) during the bud pregnancy period; Stop fertilization during the dormant period (December to February). Organic fertilizers need to be completely decomposed, and unfermented manure will produce ammonia gas to burn the roots. Trace element supplementation Yellow leaves accompanied by green veins may be a symptom of iron deficiency, so iron chelate fertilizer can be applied monthly. It is recommended to regularly irrigate ferrous sulfate solution (concentration of 0.2%) on alkaline soil in the north, which can not only adjust acid but also replenish iron. Light environment optimization strategy Light intensity gradient management The ideal light intensity is 15,000 - 25,000 lux, which can be monitored with a light meter. Full sunshine is received in spring and autumn, and 50% shade is needed in summer. Pay attention to avoid refracted light from the glass curtain wall. This concentrated light will cause the temperature of the leaf surface to rise by 5-8 ° C. Filling light skills It is recommended to use full-spectrum plant lights for indoor maintenance and fill light for 4 hours a day. Keep the lamp distance above 50cm, and adopt intermittent lighting mode (on for 2 hours and rest for 1 hour) to improve light energy utilization.
Through systematic water control, precise nutrient supply and scientific light regulation, the problem of yellow leaves of hydrangea flowers can be fundamentally improved. It is recommended to conduct monthly leaf diagnosis: yellowing of new leaves is often a deficiency, and yellowing of old leaves is often a metabolic problem. By making good observations and records during the maintenance process, hydrangea flowers can be restored to the beautiful state of Yushu Qionghua.