Unhappy hydrangea ster

Easter greetings, I bought a hydrangea a few weeks ago and have kept it in the conservatory until its warm enough to plant out.It was fine but has wilted ! It was in a small pot and the roots were popping out so I have reported it and moved to a kitchen window .Is there anything else i can do to perk it up ? Should I remove any of the wilted flower heads or leaves ?
Ilona
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Hydrangeas need a lot of water.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.