Posted: 22/03/2016 at 18:09
Grew quite a few 5 years or so ago here (west Cornwall). Hardy here
however, in the ground they became invasive....they have huge roots that swamp neighbours so not good for herbaceous or shrub borders. Grow them in large pots but divide every 2 or 3 years. Mine grew to around 6'. Nice alternative to bamboos and tall grasses....many have strongly scented flowers.
I have since dug mine up and donated to eager scroungers