Posted: 10/10/2015 at 10:50
I think Greenjude might be correct. It is known as the everlasting wallflower. I bought one, and by the time I'd left Devon it was growing all around a miniature cherry tree. They do get leggy, so I used to cut back the flower heads down to the stalks, and the flowers just kept coming. Really is everlasting flowers all year.
If it is euphorbia, and you put it in the ground, be careful, as some can spread quite prolifically.