In message , Kay
writes

Eupatorium cannabinum - Hemp Agrimony
I didn't know there was a garden Eupatorium.

52 records in Plant Finder

URL:http://www.rhs.org.uk/rhsplantfinder...crit=Eupatoriu
m&Genus=Eupatorium

I've only seen three of them, including the native E. cannabinum.
--
Stewart Robert Hinsley