In message , Capt T
writes
Can anyone help with a mystery plant that appeared this year without
warning. I have published a picture on..
www.mandeg.blogspot.com

Quite an attractive plant but a bit prone to blackfly..

Thanks for anyhelp.



Try Himalayan Balsam (Impatiens glandulifera). This is an invasive
plant, tho' not as bad as Japanese Knotweed.
--
Stewart Robert Hinsley