Posted: 02/09/2015 at 12:00
Actually Verdun, I have grown them from seed that I got from the RHS about 7 years ago. I only got two to germinate so they are precious. I grew them in pots for five years in the greenhouse and then I planted one outside and kept the other one in its pot. The planted one produced 9 flower stalks and the flowers were orange with electric blue stamens, really pretty and I think I put a picture of it on the 'what's the star in your garden' thread. They didn't get to more than 18 inches high, but I think some do.
I think that you being where you are will be able to keep them year in and out.
So go for it and please put a picture here of the white one please as I've not seen one.
I will have to look in my seed box, as I might have saved some seed from my orange ones. They do ok here if they have lots of shelter from other plants, but I have to be careful as we in Rickmansworth, Herts are in a frost hollow.