A very desirable member of the Gentian family, this grows as tight tufts of dark green, glossy leaves with many little pink flowers with yellow eyes from mid summer to autumn, carried on short, erect stems. About 7cm (3") high.
Centaurium enjoys a fairly fertile soil or compost, well-drained but never too dry and on the acid to neutral side. And it likes sunshine - in fact, the flowers only open wide in sun.
It is a British (and European) native so it's not too difficult but it isn't always easy to keep - to be honest, it is fairly short-lived in any case and 2 or 3 years is the most you can expect from it. Don't turn away; it's a plant that will gently self-seed and you will find (if you are lucky) that a few tiny seedlings will pop up here and there. You could have it for the rest of your life - if you are blessed!
Perfect in a stone sink or trough or where it can be allowed to 'do its thing' by self-seeding and not get too crowded.