My hydrangea is wilting?

My Hydrangea that I just planted seems to be wilting very quickly. It is planted in full shade but the daytime temps can get pretty warm. Some of the leaves wilt and get crunchy and some stay soft. I also noticed that on the underside of 1 or 2 leaves a white waxy looking stuff formed. There is not very much of it though. What is wrong with it I really want to keep it alive and get it blooming. It is a hydrangea macrophylla.