This new way of watering the flowers has changed my hydrangea-loving life. I did it about 3 hours before I went to bed and she minimal results. For real. And if those hydrangeas wilt even so, fill the sink with water and soak the heads in it for several hours. Make sure you know the best everyday care of hydrangeas. 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. To prevent wilting in the first place, cut or select only hydrangeas that are fully open. The most comfortable temperature for these plants is 70 ° F (21 ° C). Your hydrangeas may even seem to shrink from one year to the next. No plants in ground since last year should need supplemental watering in those conditions. 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. Water your hydrangea less if the soil is soaking wet. If the blooms start to wilt, shock them back by dunking the whole flower head in warm water for a few minutes. 4. Hydrangeas do not like wet feet and irreversible rot can occur if it is watered too much. Oh my golly – I tried your suggestion to revive my cut hydrangeas that were wilting and I cannot believe how stunning they are!!! Hydrangea wilting in the sun and heat. Looking at weather.com for Springfield, MO, looks like there's already more rain than in all of June, on average. An exception to the rule of “no need to cover hydrangeas… The bouquet of white hydrangeas Ryan brought home lasted for just over two weeks when watered this way. 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 if it is wilting and the soil is dry. Bigleaf hydrangeas are suitable for U.S. Department of Agriculture plant hardiness zones 5 through 11. Hydrangeas do not wilt in the heat here, it's over 90 every day for months. Hydrangeas grow and bloom best in areas where they can get at least a few freezes in the winter. Alum is a spice that I believe is used for pickling or the like. To be honest, I have never used it for anything but flowers haha. Yes, the blooms- not the stems. What happening and what can I do – Thanks in advance! A temperature between 65 and 75 degrees Fahrenheit is ideal, with temperatures that do not fall below 50 degrees Fahrenheit at night. It’s not uncommon to find them suddenly tired and wilting, as if they’re on death’s doorstep. Hydrangeas tend to become especially stressed in hot sunny conditions, they perform best in morning sun or partially shady areas. Everyday Care of Hydrangeas. A hydrangea's flowers signal the end of their bloom period by wilting and drying. 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