I'm curious if anyone has had coleus drop seeds in the ground that grew back the year after?

I have a 35 gallon bucket growing 6 different coleus plants, all of which have begun to profusely flower in their shady, north facing location. There's an additional plant (removed from the bucket due to overcrowding) planted directly into a shady garden bed, and it too is flowering.

I'm not interested in saving the seeds intentionally, because the plants were very cheap and if none grow back I'll just buy more next year. It would be VERY cool if they simply grew back, though!