I sowed a packet of T&M's scented flowers in spring, and there's a lot of something out now that must be common but I don't know what it is.
It's about 8"-10" high, with quite narrow, very toothed nettle-shaped leaves that were very purplish when young, and deep red stems. Initially, I thought the leaves smelt of aniseed, but now I think it's lemon. It has large bright blue lipped flowers in whorls. They're quite big, like a Salvia, but it doesn't have a rosette of leaves at the base.
I think it is a Dracocephalum species. See similar images on http://www.anjastuin.nl/dracocephalum.html. Several Dracocephalum species have a lemon / minty flavour, e.g. D. moldavicum and D. nutans.
Thank you, it does look like a Dracocephalum. Now I know what it is, I'll move it somewhere it can be appreciated. When the packed said Fragrant, I was expecting scented flowers, but I do like smelly leaves!