Hydrangea Paniculata- What is the best place to plant and aftercare for one of these Magical Moonlight)

They like dappled shade and a reasonable soil, so if I were you I would add some compost to your sandy soil. this would also help moisture retention. After care is dead easy, leave them alone. OR, if you are pressed for space, prune down to 6 inches in February. They flower on new wood so you are not removing fowers as one would be doing with H. macrophylla.