Do you have a source for that statement? That no annual seeds in your zone need any type of winter/cold stratifying.

Once I read that and understand all that it refers to then I can answer better. It seems like this is something taken from a larger article or document and I need to read all of it to get the author's point of view.

Is it possible that the statement should be "from" your zone" not "in" your zone? Adaption to natural climate and environment is certainly part of genetics but that can take many multiple generations to develop a distinct landrace.

Im guessing the verb should be "tolerates" and not "needs".

:)