Bougainvillea Plant Yellow Leaves. The most common reason for leaf loss in bougainvillea plants is over watering. Insects and disease can cause yellowing leaves.
Mix 2 teaspoons into a gallon of water and spray the soil thoroughly. Profuse flowering requires a high light intensity of a minimum of six hours every day. Inadequate water and poor lighting are the most common reasons but you should also inspect for nutrient deficiencies and pests.
Lack of sunlight may cause the yellowing of leaves initially which eventually turns into brown leaves over time.
05092017 My small potted Bougainvillea plant which has not bloomed for me all Summer here in the NYC area is now starting to show signs of yellow leaves. The most common reason for leaf loss in bougainvillea plants is over watering. 14072020 The plant features rich green leaves and brightly coloured flowers and yellowing of leaves can indicate a serious problem--from insects to vitamin deficiency. Look for small spider-like insects if the bougainvillea leaves turn yellow and drop from the plant.