The causes and solutions of yellowing leaves of bougainvillea

Improper watering

Bougainvillea has different water requirements in each season. Improper watering can easily cause yellow leaves.

Water once a day in spring and autumn, water once in the morning and evening in summer. In winter, the temperature is lower and the plant is in the first half of its dormant period, so watering should be reduced and the soil in the pot should be kept slightly moist.

Improper lighting

Flower lovers who have grown bougainvillea know that without sunlight, bougainvillea is like a fish out of water, and it will surely die. Due to lack of light, at the beginning, the plant's branches are weak and there are fewer flowers. Then the leaves turn yellow, and the plant gradually wilts until it dies.

Therefore, all year round, except for the newly potted seedlings, they should be placed in semi-shade. In winter, it should be placed in front of a south-facing window and the light exposure time should not be less than 8 hours, otherwise a large amount of leaves will easily fall.

Improper soil selection

Bougainvillea is not very demanding on the soil, but is afraid of waterlogging and cannot tolerate waterlogging. Therefore, you must choose a loose, well-drained culture soil. Generally, you can use a culture soil prepared from 4 parts of humus soil, 4 parts of garden soil, and 2 parts of sand. You can also use dried pond mud mixed with some coal cake residue as potting soil. In addition, when you repot every year, you need to replace half of the old soil and add new soil to ensure that there are sufficient nutrients in the soil.

Improper fertilization

Bougainvillea often turns yellow due to improper fertilization. In hot summer or cold winter, the plant grows slowly or even goes dormant, so fertilizing should be stopped. Fertilizing at this time will cause fertilizer damage, leading to root rot and yellowing leaves. If you apply fertilizer at different concentrations or in different amounts, or apply raw fertilizer, it will damage the roots, cause the leaves to fall off, or even the death of the plant.

Diseases

Bougainvillea leaf spot disease and brown spot disease will not cause the leaves of the plant to turn yellow. In the early stage of the disease, yellow or brown spots will appear on the leaves. The spots will gradually expand and the leaves will gradually fade and fall off.

Therefore, during daily maintenance, strengthen ventilation and maintain the humidity of the leaves; remove and destroy the damaged leaves in time; spray 50% 1000 times solution of thiophanate-methyl or other fungicides in time.