Today’s Quiz Question is actually more a plea for help to identify a roadside plant which caught my eye yesterday. 
It was tall, at least 1.2m, and grew in a large clump. It had the faintest blue flowers.
I thought the leaves might give it away as they were quite distinctive but, Google has let me down on this one.
I am sure it must be common and well known, but not to me!
Any ideas please?






