That's really great that they seeded for you all by themselves. I don't know whether to laugh or cry all the work I put in to growing orientals from seed. I have had a few flower, but most of the time I lose them that second year. My love for them makes me never give up on them though. One day I hope I will succeed.
I would never be so lucky as to have them go to seed and leaf out on their own. Nice job!