Hi gardenfanatic- the stems are very rough and prickly, but I really don't mind if they are annuals. In fact that's probably better as now I can move things about Lovely plants once they start to flower.
The shady area that I've been thinking of does get some sunshine, I've got a bit of space to fill there. I do like white in the garden always looks great no matter the weather and sunshine. Sounds/looks like a lovely plant to have especially as you have propagated it.