What Causes Black Spots on the Leaves of Hydroponic Epipremnum aureum
Hydroponic Epipremnum aureum, as a common indoor ornamental plant, the appearance of black spots on its leaves is a typical problem that troubles plant enthusiasts. This article systematically analyzes the causes of black spots and provides solutions, discussing professional approaches through temperature control, environmental optimization, and lighting management, to help you quickly restore the healthy state of Epipremnum aureum.
I. Temperature Abnormalities Leading to Black Spots
1.1 Symptoms of Low Temperature Frostbite
When the water temperature in winter drops below 12℃, the absorption function of the roots is obstructed, causing black-brown spots to first appear at the leaf tips, which then spread to the entire leaf surface. The periods before heating in the north and during spring cold snaps are high-risk times.
1.2 Emergency Treatment Plan
Immediately move the plant to an environment above 15℃, and cut off leaves that are more than 50% damaged. Use a double-layer container hydroponic method (inner bottle filled with water, outer bottle filled with insulating material) to maintain stable water temperature.
II. Poor Ventilation Inducing Lesions
2.1 Hazards of Stuffy Environment
In the summer, with high temperatures (>30℃) and humidity >75%, closed spaces can easily breed mold. Initially, the leaves develop watermark-like dark spots, which turn black and necrotic within 48 hours.
2.2 Optimization of Air Circulation
Install a mini circulation fan to maintain air flow, and open the windows 2-3 times a day. Keep a 10cm gap between the hydroponic bottle and the wall to avoid forming air dead spots.
III. Key Points of Lighting Management
3.1 Standard for Light Intensity Control
The ideal light intensity is between 800-1200Lux. Direct sunlight can cause light burn spots (edges turning black), while long-term shade can trigger metabolic black spots (center diffusing type).
3.2 Smart Lighting Solution
Use full-spectrum plant lights to provide additional lighting for 4 hours daily, with a distance of 40-50cm from the leaf surface. Combine with a shading net to adjust the light intensity on the west-facing windowsill during summer.
Comprehensive prevention and control require establishing a maintenance log, recording data such as water temperature, lighting duration, and water change cycles. It is recommended to add 2 drops of 3% hydrogen peroxide solution every 15 days for root disinfection, and to use a special hydroponic nutrient solution (EC value controlled between 1.2-1.8mS/cm). Through systematic management, it is effectively possible to prevent the recurrence of black spots and maintain healthy, glossy leaves.