Tomato braving the cold and flowering in the garden.

Will be interested to see what happens.  I recently planted a couple of horseradish thongs in the greenhouse in an old pot filled with soil from last year.  After about 6 weeks lots of HR leaves grew and quite a few tomato seedlings which are obviously from the tomatoes that were in the soil last year.  I put the pot outside 2 weeks ago as ran out of space in the greenhouse and they look fine.