Posted: 24/11/2013 at 17:52
Thanks for all your replies - it is beautiful, isn't it? The flowers are a pale mauve - I had the flash on on my phone which makes them look whiter than they are. I think you are all right - a salvia of some sort. The leaves have a darker, almost red underside. They do look like the the amistad one but websites say this is a very new plant - my Dad has had it many years - and that it's hardy which this isn't.