I got a small plant (from my mother-in-law... ) on which I would like to have an ID with your help. I cannot say much about its life-cycle as I only got it recently: she told me it was once in a pot and she put it outside. Thus I assume it survived winters with peaks down to -20 C.
- tiny white flowers (1.5cm in diameter)
- saw-teethed leaves (2cm long, 1.5 large, reminds me of birch-leaves)
- flowers die back quite fast (a few days), but new one are coming out again quickly
Some images (click to enlarge)