An exception to the rule of “no need to cover 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. However, not everyone has the opportunity to … And if those hydrangeas wilt even so, fill the sink with water and soak the heads in it for several hours. 4. If the blooms start to wilt, shock them back by dunking the whole flower head in warm water for a few minutes. The most comfortable temperature for these plants is 70 ° F (21 ° C). Bigleaf hydrangeas are suitable for U.S. Department of Agriculture plant hardiness zones 5 through 11. Your hydrangeas may even seem to shrink from one year to the next. It’s not uncommon to find them suddenly tired and wilting, as if they’re on death’s doorstep. Looking at weather.com for Springfield, MO, looks like there's already more rain than in all of June, on average. Wilt and browning are difficult to diagnose, as there are many factors that may be the cause: too much sun, wind, not enough water, to much water, etc. If the hydrangea is subjected to extreme heat, the foliage begins to wilt, and the flowers begin to lose their petals. To prevent wilting in the first place, cut or select only hydrangeas that are fully open. 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. 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. Hydrangea wilting in the sun and heat. Water your hydrangea less if the soil is soaking wet. Alum is a spice that I believe is used for pickling or the like. Hydrangeas do not wilt in the heat here, it's over 90 every day for months. Everyday Care of Hydrangeas. For real. To be honest, I have never used it for anything but flowers haha. So, unless one lives in a very cold climate, hydrangeas do not need to be covered when normal winter temperatures are experienced. Hydrangeas tend to become especially stressed in hot sunny conditions, they perform best in morning sun or partially shady areas. No plants in ground since last year should need supplemental watering in those conditions. Oh my golly – I tried your suggestion to revive my cut hydrangeas that were wilting and I cannot believe how stunning they are!!! Q • I have for several years had beautiful hydrangea blooms from several different varieties. This new way of watering the flowers has changed my hydrangea-loving life. Yes, the blooms- not the stems. We have 14 plants, and this year several plants have suddenly developed wilting stem and died. 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