A deservedly popular alpine with little dark-eyed, violet-blue flowers with yellow centres which stare up at you from tufts of grassy foliage from early summer onwards. It's an easy-going little plant that only asks for a well-drained soil and some sunshine. About 12cm (5") high.
Some Sisyrinchium (yellow ones especially) are notorious for spreading their seeds far and wide and a rockery can quickly become crowded with them, but E.K. Balls doesn't; it's a more refined plant (like all the Sisyrinchium we offer).