We transplanted 4 hydrangeas last fall and they have been looking great with new leaves on all of them. We noticed today that 2 plants have a couple of wilted leaves on them while all the other leaves a strong. What causes this and how do we stop the progress?
Your plants likely need some irrigation until they are established.
Water them twice a week, about an inch per watering.
Apply 2 to 3 inches of hardwood mulch to help with moisture retention.
Keep in mind that Hydrangea do tend to wilt during the heat of the day, but recover as temperatures cool in the evening.