What to Do If a Phalaenopsis Is Frostbitten
Low temperatures in winter can easily cause frostbite in Phalaenopsis orchids, leading to typical symptoms such as softened and blackened leaves, and萎缩 (atrophy) of the root system, which seriously affect the health of the plant. Mastering the correct emergency treatment methods after frostbite can effectively improve the survival rate of the plant. This article explains 5 key steps for treatment, accompanied by professional illustrations to help you quickly rescue frostbitten Phalaenopsis.
1. Post-Frost Environmental Control
1.1 Indoor Transfer Standards
Immediate transfer to an indoor environment is required when the temperature drops below 10°C, with the optimal temperature being 18±2°C. Avoid placing near air conditioner outlets and radiators, maintaining a safe distance of over 1.5 meters. It is recommended to use a thermometer for real-time monitoring, and in heating areas of the north, use a humidifier to maintain 50% humidity.
1.2 Key Points of Light Management
Frostbitten plants should be placed in a location with ample diffused light, receiving 4-6 hours of gentle sunlight daily. Use a shade cloth with 40% coverage to adjust, avoiding direct sunlight that could cause secondary damage.
2. Reviving the Plant
2.1 Scientific Watering Plan
Use warm water at 25°C for atomized spraying, choosing to water the leaves at 10 a.m. The water should be exposed to air for 3 days to remove chlorine, with the EC value controlled between 0.3-0.5mS/cm. You can add 0.1%保利丰 antifreeze, forming a protective film to reduce evaporation.
2.2 Nutrient Supplement Strategy
Begin applying potassium dihydrogen phosphate (at a concentration of 0.05%) on the 3rd day after frost, and spray on the leaves once every 10 days. Combine with kelp extract (diluted 1500 times) for root irrigation to promote new root growth. Avoid using nitrogen-containing fertilizers to prevent stimulating damaged tissue.
3. Wound Repair Management
3.1 Standard for Handling Frostbitten Leaves
Leaves with more than 50% frostbite should be promptly removed, using a 45° diagonal cut with scissors that have been disinfected with alcohol. Apply methylthiophanate powder to the cut to prevent infection. Retain slightly frostbitten leaves for photosynthesis.
3.2 Physical Insulation Measures
Use a transparent PE insulation bag (thickness 0.08mm) and leave 6-8 ventilation holes with a diameter of 1cm. It is recommended to open the bag for ventilation for 2 hours daily, and gradually remove the protection after new buds have emerged. Use foam board as a pot base to insulate from cold ground.
Through three stages of temperature control, scientific watering, and nutritional repair, combined with regular observation, frostbitten Phalaenopsis usually can recover within 4-6 weeks. It is recommended to maintain a night temperature not lower than 12°C in winter and take preventive measures in advance to avoid frost damage from the root.