What Causes the Yellowing of长春花 Leaves
As an evergreen ornamental flower, the issue of yellowing leaves in长春花 troubles many planting enthusiasts. This article will delve into the causes of leaf yellowing from four dimensions: water management, light adjustment, temperature control, and nutrient supplementation, providing specific solutions to help you quickly restore the plant's healthy state.
Four Essential Care Factors for Yellowing长春花 Leaves
Scientific Watering Management
The roots of长春花 are sensitive to water. Frequent watering can lead to root rot, shown by the yellowing of new leaves; long-term water deficiency results in the browning of old leaves. It is recommended to use the "dry-wet" method: water thoroughly when the top 2 cm of the potting soil is dry, and water every 7-10 days in winter, 3-5 days in summer. Use a陶盆 with good drainage and promptly empty the accumulated water in the saucer during the rainy season.
Reasonable Light Adjustment
长春花 is a positive plant but avoids direct strong sunlight. When the UV index exceeds 5 at noon in summer, the leaves can develop sunburn-like yellow spots. It is suggested to receive full sunlight in spring and autumn, use a shade net to filter 30% of the light from 10:00 to 15:00 in summer, and move it to a south-facing windowsill in winter. Regularly rotate the pot to ensure even light exposure and use foliar spraying to cool down.
Precise Temperature Control
When the ambient temperature drops below 8°C, the plant enters a dormant period, and chlorophyll synthesis is hindered, leading to yellow leaves. Winter care requires maintaining an ideal temperature of 15-25°C. In northern regions, it is recommended to bring the plant indoors in late October and use a heating mat to maintain root temperature. The day-night temperature difference should not exceed 10°C, which can be achieved by using double glazing to isolate cold air.
Balanced Nutrient Supply
Lack of nitrogen causes old leaves to turn yellow, and iron deficiency results in the loss of green in new leaves. It is recommended to use a slow-release fertilizer with an N-P-K ratio of 20-20-20, applying 5-8 pellets every quarter. Liquid fertilizer should be diluted at a ratio of 1:1000 and alternated with compound fertilizer. If fertilizer damage is detected, immediately immerse the pot in water and rinse, and changing the water three times consecutively can alleviate 90% of root burn issues.
By establishing a watering log, installing a thermometer and hygrometer, and configuring professional grow lights, systematic management measures can effectively prevent leaf yellowing. It is recommended to check the back of the leaves monthly to prevent pests like spider mites, and maintain good ventilation to keep the长春花 blooming with vibrant greenery.