Identify tis very tall plant
My son saw this plant on an allotment in Hartlepool he asked me to identify it I have seen it before on gardeners world in an article about a couple who fell in love with it and grew it all over their garden. I'm not sure sure if they grew it commercialy or just for pleasure it's very striking and I will endeavour to describe my son sent me a photo of it but unfortunately I don't know how
to put it on here.
It's at least six feet tall
One long cone shape stem ending in a point
Smallish flowers from top to bottom spicky leaves pointing out all the way up
It looks like it doesn't belong in the British isles
It looks as though it would be more at home in a desert situation. Does anyone know what it is please