Here's what I think happened: This Iochroma cultivar was actually named for somebody called 'Violett' rather than helpfully being named for its flower colour. See, I don't think it's violet though it is a generally deeper purple than the photo above suggests which may be of a rogue seedling generated by our rather haphazard Iochroma breeding programme. You get the picture.
This is the most vigourous of all our Iochroma and can very quickly form a nice sized shrub if allowed. A bit of work could also see it trained against a wall. Unfussy and a good team-player, if you give me a bit of notice, I can get one in the post for you but it's always a favourite at the plant fairs.