What Happens When Phalaenopsis Leaves Turn Yellow
Phalaenopsis, as an elegant ornamental flower, yellowing of leaves is the most common problem in maintenance. This article will systematically analyze the causes of yellow leaves and provide targeted solutions to help flower enthusiasts quickly judge the plant's condition and achieve precise maintenance.
Deep Analysis of the Four Main Causes of Yellowing Leaves in Phalaenopsis
Metabolic Disorders Caused by Temperature Imbalance
The optimal growth temperature for Phalaenopsis is 18-28°C. When the ambient temperature is >30°C, the plant's respiratory function intensifies, leading to nutrient depletion, and excessive transpiration causes dehydrated yellow leaves. This can be controlled by maintaining the plant in an air-conditioned room, increasing air humidity to 70%, and using shade nets. It is recommended to spray the plant twice a day, early morning and late evening in summer.
Root Damage Due to Improper Water and Fertilizer Management
Waterlogging in the moss matrix for >3 days can cause root rot, which first appears as yellowing at the leaf tips and then spreads. It is recommended to use the "moist when dry" method: when the matrix is dry 2cm deep, immerse the pot in 25°C water for 5 minutes. Fertilizing should follow the "apply thin fertilizer frequently" principle, with 2000 times diluted liquid fertilizer twice a month during the growing season and additional phosphorus and potassium fertilizers during the budding stage.
Disruption of Chloroplasts Due to Imbalance in Light Intensity
Phalaenopsis requires 8000-15000 lux of scattered light, and direct sunlight for more than 2 hours can cause sunburn spots. It is recommended to place the plant near an east-facing window and use a 40% shade rate curtain to adjust. In winter, the plant can be exposed to direct sunlight for 3-4 hours. Regularly rotate the pot to ensure uniform light exposure and prevent one-sided yellowing of leaves.
Disease and Pest Infestation Damaging Leaf Tissue
Diseases like (T-J) disease and red spiders can cause pathological yellow spots, and affected plants need to be isolated promptly. After cutting the affected leaves, disinfect the cut surfaces with 75% alcohol, and alternately spray with mancozeb (1:1000) and abamectin (1:1500), once a week for 3 weeks. Emphasize the cleanliness of the leaf undersides and regularly use wet cotton swabs to remove eggs.
By controlling temperature and humidity, scientific water and fertilizer management, optimizing light conditions, and preventing diseases and pests, 90% of yellow leaf problems can be effectively solved. It is recommended to check the matrix's ventilation every quarter, replace the moss every two years, maintain a well-ventilated environment, and let Phalaenopsis continuously display its elegant posture.