Reasons and Solutions for Morning Glory Yellow Leaves
As a common ornamental plant in gardens, the issue of yellowing leaves in morning glories困扰s many gardening enthusiasts. Yellow leaves not only affect the ornamental value but also serve as a health alert from the plant. This article will delve into the three core causes and provide actionable solutions to help you restore a vibrant vine landscape.
1.1 Dangers of Overwatering
Long-term immersion of the roots in accumulated water can lead to impaired respiration and root rot. The leaves will first start to turn yellow from the edges, gradually spreading towards the veins, and in severe cases, the entire plant will wilt. It is especially important to ensure drainage during high temperatures in summer, using pots with陶粒 padding at the bottom.
1.2 Symptoms of Drought Stress
Not watering for 5 consecutive days will cause the leaves to curl and dry out, and new leaf growth will stop. It is recommended to check the soil moisture in the morning, and if the soil is dry 2 centimeters deep, water immediately.
1.3 Scientific Watering Solution
Use the immersion pot method to ensure water penetration: place the pot in a water container with 3 cm of water and soak for 15 minutes, then remove and drain. Combined with珍珠岩-based nutrient soil (30% pearl rock), the moisture retention and breathability can be balanced optimally.
Two: Nutritional Imbalance Leading to Yellowing
2.1 Identification of Fertilizer Damage
Yellow spots formed by fertilizer residue appear irregularly and often occur within 48 hours after applying foliar fertilizer. When using liquid fertilizer, the spray head should be kept more than 20 cm away from the leaves to avoid direct spraying.
2.2 Diagnosis of Deficiency Symptoms
Deficiency of nitrogen causes uniform yellowing of old leaves, while iron deficiency manifests as loss of green between the veins of new leaves. It is recommended to alternate every half month between a balanced water-soluble fertilizer (N-P-K=20-20-20) and chelated iron fertilizer, diluted at a ratio of 1:1000.
Three: Key Points for Light Control
3.1 Control of Light Intensity Threshold
Ensure 4-6 hours of scattered light daily, and during the summer midday, 30% shading is required. The optimal light intensity measured by a light meter should be maintained between 10000-30000 lux, which can be precisely controlled by adjusting the number of shading net layers.
3.2 Lighting Supplement Techniques
In winter, full-spectrum grow lights can be used, supplementing light for 2 hours daily. Keep the lamp 40 cm away from the top of the plant, and set the lighting cycle to 14 hours/day to effectively prevent yellowing leaves due to low temperatures.
Through systematic environmental control, combined with regular pruning (retaining 2 buds at the base), the yellow leaf problem can usually be improved within 2-3 weeks. It is recommended to establish a maintenance log, recording water, fertilizer, and light data to gradually master the plant's growth patterns. When new leaves turn completely green and show a healthy luster, it indicates that the rescue measures have been effective.