I have not had any luck with hydrangeas either, they wilt badly. I thought of planting them in more shade, but I am afraid they wouldn't bloom that way? Maybe after a few years when they get rooted and more established they will not wilt down as bad in the sun. I planted some Endless Summer hydrangeas last fall that I bought on a Lowe's clearance rack for like $2. I hope they do ok for me, especially after having such a bad winter their first year in the ground.
Love the Willow tree, that is one I always wanted but never space for!