Visited a beautiful but chaotic cottage garden today and there were a few plants I didnt recognis wondered if anyone can help

The above sign was next to the blue flower but as I said the garden was chaotic so wondering if its the correct sign.

Its the blue flower Im interested in

Yes there is a bit of a blue theme going on. This one was huge about 5ft tall

This time its not the blue one, it looks white but it was pink the following pic is the same plant from a distance (its the airy fairy one in the middle).

Realise Ive not given you much to work on but wonder if you can help.