I'm sure I never planted this. It settled itself maybe five years ago into a pot on my balcony in the sunny corner. I may have done the first move to a half-sunny spot. It's now also growing in a rather shady spot. The photos are deceptive - the flowers are only 1cm across, note the Lewisia for comparison. Flowers are mirror-symmetric. There are hairs on everything - stems, calyxes, leaves and backs of the flowers It looks like it should be a rock garden plant.
Resembles Erinus alpinus. On another subject your Lewisias are too wet, the one on the right may be starting to rot off. Keep dead leaves pulled and put rocks between the rosettes and the soil. Or place the pots where they never get rained on, use careful hand watering to meet all of their moisture needs.
Thanks for the replies. I'll buy the Erinus alpinus ID. Common names Fairy foxglove, Alpine balsam, Jewel flower, Liver balsam. Family seems to be Plantaginaceae (Wikipedia), though it's also shown as Scrophulariaceae (on theseedsite.co.uk): Re: the Lewisias, here I was finally remembering to water them; I'll go back to my old ways on those, at least. The only sun is on the ledge, so they'll have to put up with the rain that blows inward.
