What to Do When Lavender Leaves Wilt
As an aromatic plant native to the Mediterranean coast, lavender is beloved by gardening enthusiasts for its unique blue-purple flower spikes and soothing fragrance. However, when lavender leaves start to curl and dry up, it often indicates that the plant is facing a survival crisis. This article will analyze the four main causes of leaf wilting from a professional perspective and provide a systematic treatment plan.
1. Light Imbalance Treatment Plan
Lavender requires 6-8 hours of sunlight daily, but when UV intensity exceeds 25,000 lux in summer, it can burn the leaves. Brown spots on the leaves are a sign of sunburn. It is recommended to use a 50% shade net to control light and move the plant to a semi-shaded environment between 10:00-15:00. In winter, ensure full direct sunlight to maintain photosynthetic efficiency.
2. Water Management Standards
Soil moisture should be kept within the range of 40-60%. Use the 'finger test': insert the index finger into the soil, and if the second joint feels dry, water the plant. Immediately stop watering when waterlogging is detected, tilt the pot to drain excess water, and improve soil structure by mixing perlite/vermiculite (1:3 ratio). For severe root rot, use the 'stepwise drying method', gradually reducing moisture over 3 days.
3. Optimization of Air Circulation
A closed environment can lead to a CO2 concentration below 200ppm, which affects growth. It is recommended to maintain an air flow rate of 0.5-1m/s. Use an industrial wind speed meter to monitor, and achieve this by opening windows for cross-ventilation or installing a circulation fan. Avoid direct strong winds, and plant sway should be kept within 15 degrees.
4. Root Repair Techniques
When the EC value is detected to be >2.5mS/cm, indicating fertilizer damage, rinse with clean water 3-5 times until the drained water EC is <1.0. When pruning roots, retain 15cm of the main root, cut off the black-brown necrotic tissue, and soak in carbendazim (1:800) for 20 minutes. When repotting, use the 'stepwise soil filling method', layering and compacting to ensure roots are fully in contact with new soil.
Systematic Maintenance Suggestions
Establish a maintenance log to record temperature and humidity changes. Apply phosphorus-potassium fertilizer (NPK ratio 1:2:1) every 15 days in spring and summer, and switch to slow-release fertilizer in autumn and winter. Regularly check the undersides of leaves to prevent red spider mites, and treat any pest infestations immediately with neem oil (5ml/L) spray. Through comprehensive management, new buds can usually be observed in 2-3 weeks, indicating the plant has recovered its health.