What Causes the Ficus Lyrata to Drop Leaves
The Ficus lyrata, a common indoor green plant, often causes concern among plant enthusiasts when it suddenly drops a large number of leaves. This article systematically analyzes the phenomenon of leaf drop in Ficus lyrata, combining botanical principles and maintenance experience, to identify four major causes and provide specific solutions to help you quickly rescue the plant's health.
Core Inducements for Ficus Lyrata Leaf Drop
Sharp Temperature Fluctuations
Ficus lyrata thrives in temperatures between 20-30°C. Leaf drop due to cold damage occurs when temperatures drop below 5°C in winter. Continuous high temperatures above 35°C in summer accelerate transpiration, leading to leaf edge scorching and drop. Emergency measures: Use double insulation in winter (pot-in-pot + mulch with pine bark), and provide shade at noon in summer combined with foliar misting to cool down.
Imbalance in Light Intensity
Ensure 4 hours of scattered light daily. Long-term placement in dark areas can hinder photosynthesis. However, intense western sunlight can cause sunburn spots on the leaves. It is recommended to use a shading net with 60% light transmission. Special note: Yellowing of new leaves accompanied by the shedding of old leaves is often a sign of insufficient light.
Abnormal Nutrient Supply
During the growing season (March-September), apply a balanced water-soluble fertilizer (N-P-K=20-20-20) every two weeks. A lack of nitrogen causes the lower leaves to yellow and drop first. It is recommended to improve the soil with matured soybean cake fertilizer, keeping the EC value between 1.2-1.8 mS/cm to avoid root damage from salt accumulation.
Insect and Disease Attacks
Spider mites can cause net-like scars on the underside of leaves, while scale insects lead to honeydew contamination at the leaf stalks. It is recommended to use matrine plus orange oil essential for biological control, and in severe cases, apply a 40% spirodiclofen suspension concentrate at a dilution of 3000 times. Regularly wiping the underside of leaves with 75% alcohol can prevent the multiplication of eggs.
Building a Leaf Drop Prevention System for Ficus Lyrata
Establish a log to record temperature and humidity changes, and use a professional illuminance meter to monitor light levels. It is recommended to adopt the 'Three-Check Method': check leaf surface moisture in the morning, pot soil temperature at noon, and plant condition in the evening. Pairing陶粒 (ceramsite) mulch with an intelligent watering system can reduce maintenance risks by 35%.
By controlling temperature, managing light, applying scientific fertilization, and preventing diseases and pests, combined with intelligent monitoring equipment, it is possible to effectively control the leaf drop phenomenon in Ficus lyrata, keeping the plant lush and green throughout the year.