Hydrangea 'Zambia'

I've been quite cautious with this hydrangea which I blipped on 28 August. It's over wintered in the greenhouse whilst another one bought at the same time was planted at the back end. The difference is amazing. The outside one is looking fine and the leaves are sprouting. I noticed today, however, that this has actually started to flower. I started the hardening off process forthwith by putting it outside for an hour. It must be very confused.
Weeded my borders today and transplanted a Paeonia Sarah Bernhardt from the pink border to the hydrangea paeonia border. The root broke up and I've potted up some to see what happens. Made sure I planted 3" below soil level but it may not flower this year as they sulk if moved.