Sorry Nut - you can tell I worked in a garden centre! I got used to "translating" what customers said about their plants, or ignoring it and using my eyes instead if more appropriate.
Since 2019 I've lived in east Clare, in the west of Ireland.
No I'm not Cheggers, sorry. I just sign up with a name that will attract attention to get a better response to my question. But thanks to all those who replied.
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It's a splendid plant
In the sticks near Peterborough
It is a thug where suited. In the end I dug it out as it just went wild in the Prairie, killing everything else on its way to the end of the world.
It's a lovely plant
Welcome Keith and sorry but I have to ask, are you THE Keith Chegwin
thanks OL - we were all dying to ask!
Thug - perhaps, but nothing to stop you digging out and composting the surplus each year.
Sorry Nut - you can tell I worked in a garden centre! I got used to "translating" what customers said about their plants, or ignoring it and using my eyes instead if more appropriate.
In the sticks near Peterborough
Liri.....now I know what the man at our local GC thinks when he sees me coming
GG, you should have just asked....come on Keith, put us out of our misery and tell us
(I used to love Swapshop 
)
I think this is an Jerusalem Artichoke (Helianthus tuberosus).
No I'm not Cheggers, sorry. I just sign up with a name that will attract attention to get a better response to my question. But thanks to all those who replied.
I've just planted 2 lots of Lemon Queen. Love the yellow flowers but from all the above comments, I'll make sure it dosen't spread too far.