The Reasons and Solutions for the Yellowing Leaves of Cyclamen
Cyclamen, as a popular variety of flowers for the Chinese New Year, yellowing of the leaves is a common issue in the maintenance process. Yellow leaves not only affect the ornamental value but also serve as a health alert from the plant. This article delves into the three core elements of light, water, and nutrition to systematically analyze the causes of yellowing leaves and provide targeted solutions.
The Three Causes of Yellowing Leaves in Cyclamen and Solutions
Yellowing Leaves Caused by Light Imbalance
As a typical positive plant, cyclamen requires 4-6 hours of scattered light every day. When exposed to an environment with light intensity below 3000 lux for an extended period, the synthesis of chlorophyll in the leaves is hindered, resulting in interveinal chlorosis and yellowing. In spring and autumn, it can be exposed to morning direct sunlight, while in summer, a shading net should be used to filter 30% of the intense light, and in winter, a plant growth lamp can be used to extend the lighting to 8 hours. It is recommended to rotate the pot 180 degrees weekly to ensure even light exposure.
Yellowing Leaves Due to Improper Water Management
Using the pot immersion method to water can maintain the substrate moisture between 40-60%. When the soil moisture content is below 20%, the capillary roots are damaged, leading to a decrease in transport function, and the older leaves first show marginal browning. It is recommended to use the bamboo stake test: insert the bamboo stake 2/3 into the soil, and if it comes out white, it is time to water. In winter, the water temperature should be the same as the room temperature to avoid stimulating the roots with cold water.
Yellowing Leaves Due to Nutrient Deficiency
During the growing period, it is necessary to ensure a balanced supply of nitrogen, phosphorus, and potassium in a ratio of 2:1:1. A nitrogen deficiency causes the entire plant to yellow, while iron deficiency causes the new leaves to show interveinal chlorosis. It is recommended to use decomposed sheep manure as a base fertilizer, combined with foliar application of a 0.1% ferrous sulfate solution. Note that after fertilizing, it is necessary to water thoroughly the next day to prevent salt accumulation. Fertilization should be stopped during the dormant period.
Systematic Maintenance Solution Recommendations
Establish a maintenance log to record environmental parameters, maintain a day-night temperature difference of 8-10°C, and keep the air humidity between 50%-70%. Every quarter, use a 1000 times solution of carbendazim to drench the roots to prevent diseases. Combine potting and pruning of old roots, using a mixed substrate of peat:perlite in a ratio of 3:1. Through comprehensive management, the rejuvenation cycle of cyclamen can be shortened to 30-45 days.