Answer: There could be several reasons for the hudrangeas to wilt. One likely reason would be shock if they were driven home in an open truck. Another would be shock if they have come out of a greenhouse and were suddenly exposed to real sun and wind. Excessive cold can cause wilting as well. Since they are already in bloom they will be particularly sensitive to cold, meaning temperatures below about 50 degrees. They should be gradually acclimated to the outdoors by being kept in a sheltered spot out of wind with early morning sun and then gradually moved into a location with longer periods of sun in the morning. Bring them indoors on cold nights by all means. Meanwhile, the potting soil must be kept evenly moist, and this may mean daily watering while they are in the pots. Once the temperatures are settled, plant them. The soil should be kept evenly moist but not sopping wet all season. A mulch can help with this.
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