Plant Identity Needed Please
Hi all, does anyone have any idea what this plant may be please. It has come up all of a sudden on our allotment and it is lovely. It's in a semi-shady area beneath a cherry tree in a bit of land that has been uncultivated for a while now.
It's about 4 to 5 feet tall, very willowy and delicate with mauve coloured flowers that resemble very delicate thistle heads. The flowers open up in the sun then completely close up into these tall points when the sun goes in.
I've added some pictures, sorry if they're a bit ropey.