1. Leaf Spot Diseases – Hydrangeas are prone to fungal leaf spot diseases, especially in humid conditions. This appears as small brown or black spots on the leaves. To prevent it, water the plants at the base and ensure good air circulation around them.
2. Powdery Mildew – This fungal disease shows up as a white, powdery coating on the leaves and can stunt growth. To control it, avoid overhead watering, space plants adequately, and use fungicides if necessary.
3. Wilting – Hydrangeas can wilt due to underwatering, overwatering, or intense heat. Ensure consistent watering, especially during dry periods, and provide afternoon shade to prevent heat stress.
4. Root Rot – Overwatering or poorly draining soil can lead to root rot, where the roots become mushy and the plant declines. Plant hydrangeas in well-draining soil and avoid excessive watering.
5. Pest Infestations – Aphids, spider mites, and scale insects can attack hydrangeas, causing damage to leaves and stems. Regularly inspect your plants, and use insecticidal soap or neem oil to control pests.
6. Bloom Failure – Hydrangeas may fail to bloom due to improper pruning, late frosts, or insufficient sunlight. Know the type of hydrangea you have and prune accordingly, and protect them from late frost.
7. Soil pH and Flower Color – For certain hydrangeas, the flower color can be affected by soil pH, with acidic soil producing blue flowers and alkaline soil leading to pink blooms. If you're aiming for a specific color, test and adjust the soil pH accordingly.
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