I love Hydrangea and have a large collection at country house. I wait till fall clearance sale and pick them up cheap ( many are missing labels) The ones that do best are planted in boggy area next to natural pond. I know everything you read says well drained soil, but here in zone 6 summer they can not have enough water. Many times after rain flooding they are standing in water for a few days. Do I lose some sure, but love them and buy them cheap so willing to experiment with them. The ones that require a lot of attention are ones I have planted in 6 foot cement urns at end of driveway. They are firelight grafted to tree forum. I wanted something very special for curb appeal. Even with sprinklers set every 2 days they still need extra water. My favorite bog shrub is cranberry, spring covered in flowers fall deep bronze leaf color, winter covered in red berries. I would post photos but camera not working