Torenia reseeded

I was trying to propagate roses when I discovered something else growing in the pot. Upon showing Mr Bear, he recognized it immediately and declared it "Torenia!"

I was surprised because (1) it was not 1 of the pots that I used for growing/layering/transplanting Torenia (2) I didn't expect it to reseed (3) my Torenia died like months ago (the layered transplant I 

gave Mutter was drowned by our enthusiastic helper and the one I gave Mr Bär somersaulted itself onto his balcony floor without success on a windy night).

Luckily I didn't tear it out thinking it was a weed. I transplanted it to another pot so that it would not crowd out my precious rose transplant. Ironically it is growing very well in its new pot now (almost died from the heat in the community garden, so I brought it home and resuscitated it with morning sun and loads of water), whereas my rose plant has kicked its bucket.

Updated!
I was going to reuse the pot where the rose has died to transplant another rose where I notice a baby seedling popping up through the pot. It looks suspiciously like torenia!