The Reasons and Solutions for the Yellowing Leaves of Bougainvillea
Bougainvillea, as a widely popular ornamental plant, often has its brilliant bracts overshadowing the health of its leaves. However, once the problem of yellowing leaves occurs, it not only affects the ornamental value but may also endanger the life of the plant. This article will systematically analyze the three main reasons for the yellowing leaves of bougainvillea and provide operational solutions.
Optimization of Soil Environment
The Dangers of Soil Compaction
Long-term use of cultivation soil can easily lead to compaction and hardening, resulting in poor irrigation and drainage. In this state, the roots cannot breathe normally, leading to blocked nutrient transport and the leaves starting to turn yellow from the edges.
Improvement Formula and Operations
It is recommended to use a breathable matrix: decomposed leaf soil (for fertility retention) + garden soil (for root fixation) + perlite (20% proportion). When repotting, keep 1/3 of the core soil, cut off the blackened roots, and place the plant in a diffused light environment for 7 days to recover.
Light Control Solutions
Typical Symptoms of Insufficient Light
Lighter leaf color, longer internodes, and reduced flowering are all warning signs of insufficient light. Bougainvillea requires 4-6 hours of direct sunlight per day to maintain normal metabolism.
Key Points of Seasonal Management
In spring and autumn, full-day sun exposure is recommended, 30% shading from 11-15 hours in summer, and supplementary lighting with grow lights in winter to extend daylight. When transitioning light environments, it is necessary to do so gradually to avoid sunburn caused by sudden exposure.
Scientific Watering Strategies
Features of Yellowing Leaves Due to Water Deficiency
The leaves wilt and turn yellow from the bottom up, the petioles sag, and the potting soil cracks. Long-term drought can cause self-thinning of the roots, reducing the plant's drought resistance.
Graduated Watering Plan
Use the "soak pot method" for emergency watering: immerse the pot in water until the surface of the soil is moist, then drain and cover with a bag to keep moisture for 3 days. Maintain soil moisture at 40-60% in daily care, and combine with foliar spraying to increase air humidity.
By improving the cultivation matrix, optimizing light management, establishing a scientific watering system, and regularly supplementing ferrous sulfate (1500 times liquid), the occurrence of yellow leaves can be effectively prevented. It is recommended to clean the leaves monthly, promptly remove old yellow leaves, and allow bougainvillea to regain its flourishing and colorful blooms.