Why Are Mulberry Peony Leaves Turning Yellow
The mulberry peony, as a highly ornamental garden plant, often troubles growers with yellowing leaves. The yellowing of leaves is not only a warning sign of growth abnormalities but also a barometer of maintenance details. To systematically solve this issue, it is necessary to analyze dimensions such as water management, nutrient supply, and environmental adaptation.
Analysis of the Causes of Yellowing Leaves in Mulberry Peony
Water Regulation Imbalance Leading to Yellow Leaves
Roots immersed in water for more than 12 hours can cause respiratory distress, which is manifested by the lower leaves turning yellow first. The soil moisture can be tested using the bamboo stake method: insert it two-thirds into the potting soil, and if wet mud is brought out, stop watering. It is recommended to use the immersion method to water in summer, and keep the soil slightly dry in winter.
Abnormal Nutrient Supply Causing Chlorosis
Excessive nitrogen fertilizer can cause leaf tip burning accompanied by overall yellowing, while excessive phosphorus and potassium result in interveinal chlorosis. It is recommended to use slow-release fertilizer combined with foliar application, supplementing with trace element fertilizers containing iron and magnesium monthly. If yellow leaves appear within 24 hours after fertilizing, rinse the roots with water immediately.
Environmental Changes Causing Stress Responses
Sudden temperature changes over 8°C or sudden changes in light intensity by 50% can trigger protective yellowing of leaves. When transplanting, retain the original soil ball and use shade nets during the transition period to adjust light. In northern regions, be aware of excessively dry potting soil caused by underfloor heating in winter, and it is recommended to use a humidifier to maintain air humidity above 40%.
Systematic Solutions for Yellowing Leaves in Mulberry Peony
Establishing a Scientific Watering System
Use the 'inspection, listening, inquiry, and pulse-taking' diagnostic method: observe the luster of the leaves, smell the soil, touch the top 3cm of soil, and check the pot's ventilation holes. Maintain soil moisture at 30%-40% in spring and autumn, and increase it to 50% in summer but avoid waterlogging.
Building a Nutrient Supply Plan
Use a nitrogen-phosphorus-potassium ratio of 3:1:2 during the growing period and adjust to 1:3:2 during flowering. Alternate between organic and chemical fertilizers, supplementing with decomposed sheep manure every quarter to improve soil structure. In the early stages of yellowing, apply chelated iron solution to quickly replenish iron.
Improving Environmental Adaptation Mechanisms
Set up an environmental transition buffer zone, and new plants need to adapt to scattered light for 7-10 days. Use double-layer pots for insulation in winter and lay ceramic stones at the bottom of the pot to enhance aeration in summer. Regularly rotate the pot to ensure even light exposure.
By establishing a water monitoring log, creating a fertilizing calendar, and setting up environmental monitoring instruments, the yellowing of mulberry peony leaves can be effectively prevented. The key is to follow the 'three observation principles': observe leaf color in the morning, check soil conditions at noon, and inspect growth in the evening to achieve fine management of the maintenance process.