Hello! I got a hydrangea plant from the store. It has not flowered yet, and is quite a small tender plant. The weather in the Midwest has not made up it's mind yet, though it is officially Summer. Can I go ahead and plant it in my garden now, or should I wait until fall to plant it? Can it stay in the same container, or do I need to repot it? I'm a novice at gardening, and all the info on the net is baffling and not clear to me... Please advise.