Don't Worry About Withered Leaves
As an important member of the national orchid family, Jianlan is deeply loved by horticulture enthusiasts for its elegant flower posture and unique leaf形态. When you find that Jianlan leaves are drying and turning yellow, there's no need to worry excessively. By mastering scientific care methods, you can bring your Jianlan back to life. This article will systematically analyze the 8 common causes and corresponding solutions.
Analysis of the Causes of Withered Jianlan Leaves
Imbalance in Water Management
Jianlan prefers a humid environment, but its roots are highly sensitive to waterlogging. Excessive watering can cause root rot, which manifests as brown and dry leaf tips. It is recommended to adopt the "dry-wet" principle, watering thoroughly only when the surface of the planting material turns white. Rainwater or tap water that has been aired for 3 days can be used for daily watering.
Improper Fertilizer Control
Lack of or excessive nutrients can cause leaf abnormalities: leaves lack luster when nutrient deficient, and appear burnt tips when over-fertilized. It is recommended to use orchid-specific fertilizer, applying a thin layer once a month during the growing season and stopping when the leaves are glossy. Fertilizing should be completely stopped during the winter dormancy period.
Abnormal Environmental Parameters
Jianlan thrives in an environment with 55-75% air humidity. Leaves easily become dehydrated and dry in dry conditions, which can be mitigated by misting in the morning and evening. The temperature should be controlled between 18-28°C, with shading and cooling in the summer and maintaining above 10°C in winter to prevent frostbite.
Guide to Preventing and Treating Jianlan Diseases
(T-J) Disease Identification and Treatment
The typical symptom is brown circular spots on the leaf surface, which later expand into concentric rings. Upon discovery, immediately cut off the diseased leaves and spray with 800 times the solution of carbendazim, once a week for three weeks. Pay attention to strengthening ventilation and avoid prolonged waterlogging on the leaf surface.
Comprehensive Control of Scale Insects
These pests suck the sap from the leaves, causing them to turn yellow. In the early stages, they can be manually removed with a soft brush dipped in alcohol, and in severe cases, spray with scale insect control emulsion. Prevention can be achieved by regularly wiping the back of the leaves with tobacco water and maintaining a well-ventilated and well-lit environment.
Key Points for Reviving Jianlan Care
After completing problem diagnosis and treatment, it is recommended to apply brassinolide once every 15 days to promote the growth of new roots. When repotting, use a mixture of pine bark and volcanic rock (3:1) as the planting material, retaining 1/3 of the protective heart soil to reduce stress. Pay attention to avoid sources of pollution such as油烟 and pesticides, and regularly rotate the pot to ensure even light exposure.
By systematically adjusting factors such as light, temperature and humidity, water and fertilizer management, and combining scientific disease and pest control, you can expect to see new leaves of Jianlan sprouting within about 2-3 months. Remember the principle of "three parts treatment and seven parts care," regularly observe the plant's condition, and you will surely bring your Jianlan back to its lush green vitality.