We have 14 plants, and this year several plants have suddenly developed wilting stem and died. If the hydrangea is subjected to extreme heat, the foliage begins to wilt, and the flowers begin to lose their petals. Q • I have for several years had beautiful hydrangea blooms from several different varieties. Water your hydrangea less if the soil is soaking wet. Make sure you know the best everyday care of hydrangeas. So, unless one lives in a very cold climate, hydrangeas do not need to be covered when normal winter temperatures are experienced. Hydrangea wilting in the sun and heat. A hydrangea's flowers signal the end of their bloom period by wilting and drying. No plants in ground since last year should need supplemental watering in those conditions. Most hydrangeas do not like the full sun; they need a few hours of direct sunlight a day; the rest of the time, they prefer to be in the shade. What happening and what can I do – Thanks in advance! Your hydrangeas may even seem to shrink from one year to the next. 4. Here’s how to revive wilted hydrangeas and get them looking great again! If the blooms start to wilt, shock them back by dunking the whole flower head in warm water for a few minutes. Alum is a spice that I believe is used for pickling or the like. Yes, the blooms- not the stems. Hydrangeas do not like wet feet and irreversible rot can occur if it is watered too much. The bouquet of white hydrangeas Ryan brought home lasted for just over two weeks when watered this way. I did it about 3 hours before I went to bed and she minimal results. It’s not uncommon to find them suddenly tired and wilting, as if they’re on death’s doorstep. Bigleaf hydrangeas are suitable for U.S. Department of Agriculture plant hardiness zones 5 through 11. Water your hydrangea if it is wilting and the soil is dry. To be honest, I have never used it for anything but flowers haha. Everyday Care of Hydrangeas. Hydrangeas grow and bloom best in areas where they can get at least a few freezes in the winter. A temperature between 65 and 75 degrees Fahrenheit is ideal, with temperatures that do not fall below 50 degrees Fahrenheit at night. The most comfortable temperature for these plants is 70 ° F (21 ° C). Hydrangeas do not wilt in the heat here, it's over 90 every day for months. For real. This new way of watering the flowers has changed my hydrangea-loving life. Hydrangeas tend to become especially stressed in hot sunny conditions, they perform best in morning sun or partially shady areas. Oh my golly – I tried your suggestion to revive my cut hydrangeas that were wilting and I cannot believe how stunning they are!!! And if those hydrangeas wilt even so, fill the sink with water and soak the heads in it for several hours. 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