Why Are My Bougainvillea Leaves Curling?

Curling leaves on bougainvillea are a clear sign the plant is stressed. While bougainvillea is hardy, its leaves react quickly to issues with watering, pests, sunlight, or nutrition. Curling can range from slight rolling at the edges to tightly twisted leaves. Identifying the underlying cause is the first step to restoring healthy, flat foliage and keeping the plant on track for strong growth and flowering.

Common Causes of Curling Leaves

Bougainvillea leaves curl for a few key reasons. Checking each one will usually reveal the problem quickly:

• Water stress: Both underwatering and overwatering can cause curling. Underwatered plants curl to conserve moisture, while overwatered plants suffer root stress that shows as twisted foliage.
• Pest infestation: Aphids, thrips, and spider mites feed on sap, leading to distorted, curled leaves. Look for sticky residue or fine webbing.
• Sunlight imbalance: Too much shade produces weak, curled leaves. Extreme heat or hot winds can also cause leaf edges to roll.
• Nutrient deficiency: Lack of calcium or magnesium can cause curling and distortion, often alongside yellowing.
• Transplant shock: Recently repotted or relocated bougainvillea may show leaf curling as it adjusts to new conditions.

Observing whether the problem is uniform across the plant or localised to new growth helps narrow down the cause.