An absolute jewel. I recommend clicking on the picture and looking at a larger size to see the delicate blue patterning on the falls. A semi woodland species in the wild but quite adaptable on any well-drained soil, in sun or semi shade, and without too much competition.
A graceful medium-sized western Asian species with beautifully marked violet and cream flowers. In the wild it grows in well-drained sunny conditions which might lead us to imagine it doesn't need much moisture, but in fact good flowering depends on plentiful water in spring.
3L pots ~ £7