What to do with yellowing of Cymbidium leaves
As a representative of elegant flowers, Moran leaves yellowing problem puzzles many gardening enthusiasts. This article will systematically analyze the five common causes of yellow leaves of Cymbidium, combine the key points of four-season maintenance, and teach you hands-on how to restore plant health. Five major causes of yellow leaves in Cymbidium are analyzed. Water management imbalance More than 67% of cases of yellow leaves in Cymbidium are due to improper watering. The roots will begin to rot after being immersed in stagnant water for 24 hours, showing yellowing and curling leaf tips. It is recommended to use the "three-finger test method": insert the index finger, middle finger and ring finger into the substrate to a depth of 2cm, and if only the fingertips are slightly moist, the best time to water. Nutrient supply imbalance requires only 1/3 of that of ordinary green plants. Excessive fertilization will lead to scorched yellow patches on leaf margins. It is recommended to use special slow-release fertilizer for orchids, combined with the "quarter-concentration rule": dilute the fertilizer to 25% of the specified concentration, apply it twice a month in spring and autumn, and stop fertilizer in summer. How to deal with the yellowing of Cymbidium leaves due to drastic temperature fluctuations
Cymbidium grows best in the range of 10-28℃, and frost-like spots are prone to appear on leaves when the temperature difference between day and night is greater than 8℃. In winter, it is necessary to keep the night temperature>12 ° C. Double-layer insulation method can be used: the inner layer is covered with non-woven fabrics, and the outer layer is erected with a plastic shed to maintain air circulation. Improper light regulation requires 15,000 - 20,000 Lux scattered light. Direct exposure to strong light for 4 hours will cause sunburn macula. It is recommended to use the "curtain filtering method": the east-facing window sill is matched with white gauze curtains to ensure that the plants receive 2-3 hours of soft morning light every day. Pest and insect infestation (T-J) diseases and scale insects are the main causes of pathological yellow leaves. When brown spots on the back of leaves are found, a "three-step treatment method" should be adopted in time: ① isolate the diseased plants ② prune the diseased leaves ③ alternately spray mancozeb and carbendazim (concentration 1:1500) once a week for one month.
Through scientific diagnosis + precise maintenance, more than 90% of yellow leaf problems can be improved within 3 weeks. It is recommended to establish a maintenance log to record watering, fertilization time and environmental parameters, and gradually understand the growth laws of Cymbidium japonica.