Lack of water will make for a very droopy, unhappy looking hydrangea with wilted leaves. Among some pests to watch for are aphids, red spiders, leaf tiers, and rose chafers. Hydrangea foliage is also susceptible to leaf spots and powdery mildew. Always treat insects or diseased plants as soon as possible. Your friendly local garden will be able to quickly steer you in the right direction for a proper treatment plan if needed.
Hydrangeas can provide much enjoyment for many seasons when properly cared for.