This morning I was surfing for seed stratification trying to decide if I need to stratify my lupine and prairie cone flower seeds, and came across some interesting info (at least I thought it was interesting). Here is a list of plants whose seeds require stratification to germinate. Looking at the list I assume most would have to be treated as annuals in our climate. I grew many of those up north but am sticking mostly with natives in my Florida beds:

http://www.canadiangardening.com/how-to/seeds/how-to-stratify-seeds/a/1972/2 

This site has some interesting info about sowing and germinating seeds - something most of us know about but we read about it and learn something new:

http://jlhudsonseeds.net/Germination.htm