Why Are My Bougainvillea Leaves Turning Yellow?

Yellow leaves on bougainvillea are a sign that something in its care routine is out of balance. While bougainvillea is hardy, it reacts quickly to stress, showing leaf yellowing before dropping foliage. The main causes include overwatering, lack of sunlight, poor drainage, nutrient deficiencies, or sudden changes in conditions. Identifying the exact reason is the first step to fixing the problem and restoring vibrant growth.

Common Causes of Yellow Bougainvillea Leaves

Several factors can lead to yellowing, and each presents slightly differently:

• Overwatering: Constantly wet soil suffocates roots, leading to pale, yellowing leaves and eventual drop.
• Poor drainage: Heavy clay or compacted soil holds water, stressing roots in the same way as overwatering.
• Insufficient sunlight: Bougainvillea needs six hours of direct sun daily. In shaded spots, leaves may yellow and fall as the plant struggles.
• Nutrient deficiency: Lack of nitrogen can cause uniform pale yellowing, while magnesium or iron deficiency shows as yellow between green veins (chlorosis).
• Stress or shock: Repotting, pruning too hard, or sudden weather changes can trigger temporary yellowing as the plant adjusts.

By checking water, light, and soil first, you can usually narrow down the cause before moving to feeding adjustments.