My hydrangea is crumpled!

[TheOneWiththeNicestSmile]

Can anybody tell me what's wrong, please? There are flowers starting to form.

There are 2 different plants in this tub, the one at the back is ok

TIA

I have sprayed it with a pesticide but only once

Could be aphids on it? Is it in a large enough pot, and well watered. May be separate them, so a pot each, so 'good' one doesn't get contaminated. Don't you have room in the garden for them; they can grow lovely and big then!

Check the small print on the spray, as some are not suitable for hydrangeas.

Take a look at the back of the leaves, is there anything on there?