Posted: 06/01/2015 at 19:48
I never protect mine, in a hard winter the leaves turn to mush. I've found it rather shy flowering. 15 years (ono) 3 or 4 brilliant, a few not bad and some no flowers at all. I haven't been able to relate performance to winter temperatures but this last summer, after a very wet winter, it flowered well but very tall and fell over which it's never done before.