It looks as if this might suit one location, provided that we don't
get any hot, dry summers again. But I want one that is vaguely
upright, preferably with a long flowering period, and does NOT go
more than very slightly pink. Not Limelight, as I want it white
(preferably pure, rather than cream, if possible).

Kyushu looks plausible, but have I got it right? If not, or anyway,
are there any other suggestions?

The only other plant that I can find that fits the bill is Spirea
nipponica. It's a location that gets only late afternoon and evening
sun, and then only in summer, and needs to grow above some blood
red paeonies but not take up too much space sideways. Tricky.


Regards,
Nick Maclaren.