After stripping the garden to an almost blank after the flooding I bought 3
hydrangea macrophylla hortensia.

The tag on them says:-
Plenty of light, no direct sunlight
Plant in the garden after flowering

I can't understand the light thing. Bit of a paradox! IMO
Also why would it matter if I planted in the garden whilst in flower?

I would like them to be in their place when OH gets home after her
holidays. She likes them and it's a surprise.

Also, I hear now that the colours change with soil Ph. My head hurts now.

Thanks
Baz