What should I do if the leaves of snow yellow?
As a treasure in orchid, the problem of yellowing leaves often worries the conservators. This article will systematically analyze the causes of yellow leaves and provide targeted treatment plans to help you quickly restore plant vitality. In-depth analysis of the causes of heavy snow yellow leaves, natural metabolic mechanisms When new leaves germinate, the old leaves at the base will naturally yellow and fall off. This is a normal metabolic phenomenon of plants and requires no special treatment. It is recommended to prune 2-3 old leaves every season to maintain an attractive plant type. Imbalance of light intensity Direct light for more than 3 hours at noon in summer will cause damage to chloroplasts. Especially after heavy rains, residual water droplets on leaves will produce a convex lens effect, causing burned spots on the leaves. It is recommended to use a 50% sunshade net to adjust the light. Misunderstanding of water and fertilizer management It is recommended to maintain the "three-look principle" for watering frequency: look at the substrate (the surface is 2cm dry), look at the leaf condition (leaf tips are slightly curled), and look at the season (5 days per time in spring and autumn, 3 days per time in summer). Fertilization must follow the golden ratio of N-P-K=20-20 -20, and apply orchid special liquid fertilizer diluted 2000 times every month. The precise pruning technology of the system treatment plan for heavy snow yellow leaves uses a 45° oblique shear method to remove yellow leaves, and the best place between the incision and healthy tissue is 0.5cm. Apply carbendazim powder after pruning to prevent bacterial infection. The environmental control strategy sets a "dry and wet cycle" mechanism: maintain the environmental humidity of 60%-70% after watering, and cooperate with a breeze cycle of 0.5m/s per hour. It is recommended to use a temperature and humidity meter for real-time monitoring and turn on the dehumidification equipment during the rainy season. Scientific fertilizer supplement plan Apply 500 times solution of iron chelate fertilizer (Fe-EDTA) in the early stage of yellow leaves, combined with 0.1% magnesium sulfate solution for foliar spraying. When there is serious nutrient deficiency, the plant replacement method can be used: a new substrate containing pine bark (40%), volcanic rock (30%), leaf soil (20%), and perlite (10%) can be mixed, and the pH value is controlled at 5.5-6.5.
Through cause diagnosis and precise intervention, more than 90% of yellow leaf problems can be improved within 2-3 weeks. It is recommended to establish a maintenance log to record data such as temperature, humidity, fertilization cycle, etc., and coordinate with regular rotation of flowerpots to ensure uniform light reception. When the new leaves are emerald green and the veins are clear, it means that the plant has returned to a healthy state.