What Causes Narcissus Leaves to Turn Yellow
Narcissus, as a popular winter ornamental plant, has many growers troubled by the yellowing of its leaves. This article will systematically analyze the four main causes of yellow leaves in narcissus and provide actionable solutions to help you quickly restore the plant's healthy state.
Improper Selection of Cultivation Substrate
Issues with Media pH Imbalance
Narcissus is highly sensitive to the cultivation medium. For hydroponics, it is recommended to use slightly acidic water with a pH value of 6.0-6.5, regularly testing for water quality changes. For soil cultivation, a mixed medium of decomposed leaf soil, river sand, and perlite (in a ratio of 2:1:1) is recommended, and the soil should be replaced every 12-18 months.
Key Steps in Water Treatment
Tap water needs to be left standing for more than 48 hours to evaporate chlorine, and warm water around 25°C is suggested for winter use. The hydroponic container should be thoroughly cleaned every week to maintain water cleanliness.
Key Points for Temperature Control
Ideal Temperature Range
Narcissus grows best at 15-20°C, with a day-night temperature difference of no more than 5°C. In summer, when temperatures exceed 28°C, it should be moved to an air-conditioned room, and in winter, when temperatures drop below 5°C, a thermal film should be set up.
Seasonal Management Strategies
In late spring and early summer, gradually reduce the duration of sunlight exposure, and use grow lights in autumn and winter to maintain 6-8 hours of light daily. When there are sudden temperature changes, adopt a progressive transition to avoid plant stress reactions.
Advanced Techniques for Light Management
Adjustment of Light Intensity
In spring and autumn, the plant should receive full sunlight, while in summer, a shading net should be used to filter 50% of direct sunlight. When indoors, rotate the pot every 3 days by 45 degrees to ensure even light exposure.
Application of Supplemental Lighting Equipment
During continuous rainy days, LED plant lights can be used to supplement light, with 4 hours of supplemental lighting daily and a distance of 30-50 centimeters from the lights. Light intensity should be controlled between 8000-12000 lux.
Comprehensive Control of Diseases and Pests
Identification of Common Diseases
Leaf spot disease initially presents as small brown spots, while large brown spot disease can cause the leaf tip to wither. Check both sides of the leaves weekly, and immediately cut off and spray the affected leaves with mancozeb solution.
Management Plan for Pest Control
Red spiders can be controlled with a mixture of neem oil and detergent (1:200), and root mites require soil replacement and drenching with abamectin. Regularly open windows to maintain air circulation and reduce the incidence of diseases and pests.
By systematically adjusting the cultivation environment and strengthening daily maintenance, the yellowing of narcissus leaves can be effectively improved. It is recommended to record plant growth data monthly and establish a personalized care档案 to gradually master the growth patterns of narcissus.