After much deliberation I've decided to move my beloved snow mountain hydrangea tree. It just isn't in the right spot and is growing lopsided because it is so close to my porch. I'm going to put either an Annabelle or Incrediball hydrangea in it's place. I assume that Fall is the best time to transplant, but is that the best time to purchase/plant a new hydrangea shrub? Or, would you transplant the tree in the fall and wait till next Spring to plant the shrub?