Methods for Winter Care of Bougainvillea
As a typical tropical ornamental plant, the winter care of bougainvillea is directly related to the quality of flowering in the following year. This article systematically analyzes five core maintenance techniques, combined with the characteristics of different regions in the north and south, to help you scientifically cope with the challenges of low temperature, allowing bougainvillea to safely survive the winter and accumulate nutrients.
Five Core Elements of Winter Care
Accurate Temperature Control
7℃ is the critical point for the survival of bougainvillea. It is recommended for people in the north to bring the plants indoors in early October. When there is a significant temperature difference between day and night, a plastic bag can be used at night for insulation. In the south, a windbreak shed needs to be set up outdoors for overwintering, and a thermometer should be used to monitor the temperature in real-time. Emergency warming measures should be taken immediately when the forecasted temperature is ≤5℃.
Scientific Water Management
In a low-temperature environment, a three-level water control mechanism needs to be established: 1. completely stop watering below 10℃; 2. add a small amount of water once a month at 10-15℃; 3. follow the normal drying-wetting principle above 15℃.
Optimized Lighting Strategy
At least 6 hours of direct sunlight is required daily. It is recommended to use a rotating tray and turn it 180° weekly. During cloudy and rainy days, a full-spectrum light can be used to supplement light for 3 hours daily, keeping the lamp at a safe distance of 50cm from the plant.
Nutrient Supply Plan
Solid fertilizers are prohibited during the dormant period. In heating environments, a foliar fertilizer of potassium dihydrogen phosphate diluted 2000 times can be applied every 20 days. Important note: avoid watering within 3 days after fertilizing to prevent nutrient loss.
Timing of Pruning
Pruning should follow the principle of retaining key nutrient branches: - Main branches should retain at least 3 buds; - Side branches should retain at least 2 buds; - After pruning, apply a healing agent to the cut surface. Special reminder: pruning is prohibited after January to avoid affecting the vernalization process.
Spring Revival Management Points
When the temperature stabilizes above 15℃, three revival operations can be gradually carried out: 1. Repotting: retain 1/3 of the soil around the root ball; 2. Top-dressing: a combination of slow-release fertilizer and organic fertilizer; 3. Shaping: the best time for traction shaping.
Through scientific winter maintenance management, not only can the bougainvillea safely survive the winter, but it can also store sufficient energy for a burst of flowers in the spring. It is recommended to adjust the maintenance details flexibly according to local climatic conditions, regularly observe the plant's condition, and cultivate premium bougainvillea with an astonishing number of flowers.