In message , Bob Hobden
writes

Changing the subject slightly did anyone else see the Hibiscus that
they had at RBG Kew last summer next to the Princess of Wales
glasshouse. Huge dinner plate flowers, the biggest Hibiscus flowers
I've ever see and I've been to many tropical places. Now last time I
visited, about 3 months ago, I noticed they haven't dug up the roots
just pruned them down to ground level as if they expect them to shoot
again. Anyone know if they will/have and what species or hybrid these
plants were? I might just be able to find space for one or two. :-)


That's presumably Hibiscus moscheutos or one of its allies, hybrids or
cultivars. These are hardy herbaceous perennial hibiscus from North
America (H. moscheutos is native as far north as southern Ontario),
sometimes called "dinner-plate hibiscus". IIRC, the largest flowers come
from strains such as 'Galaxy', 'Southern Belle' and 'Dixie Belle'.
--
Stewart Robert Hinsley