Answer: Hydrangeas tend to wilt when they're planted in full sunshine. The wilting may make you think that it needs water, but in reality the plant is reacting to hot afternoon sunshine by slowing down its transpiration rate. Overly wet soils will not help the leaves perk up but it can suffocate the roots. Instead of watering everyday, water your hydrangeas deeply once a week (twice if the soil drains quickly and the weather is hot). If this hydrangea is the only one that wilts, it may be happier in a spot that provides filtered afternoon sunshine. Best wishes with your garden!
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