For newbies like myself, I find seed stratification and germination to be a complex subject. I can't telll which species require cold stratification and which need to be sown right away. Is there a rule of thimbto follow? I tried applying what seemed to be a "common sense" approach to it, but I don't know if it matches up with reality. Is it a general truism that plants that go through dormancy / colder tolerance plants to produce seeds that require cold strtification? Conversely, would it also be true that the warmer climate plants don't require stratification and thus should be sown as soon as possible?