Hydrangea late summer

On 12 April I blipped a lively blue hydrangea, this potted one, after I first bought it. Now it has toughed it out over the summer and is into its second blooms that are turning a bit pink because I do not have naturally acid water.  As fara as I can tell this plant cannot stay outside all winter and survive. It will be coming in in a few weeks.
That's a paper butterfly decorating it.