I got the book at Chapters hazel. You can probably order it on line though.
If seeds are normally from a plant that reseeds itself I am of the opinion they do much better if broadcast in the fall. That way they go through the normal ebbs and flows of the seasons before growing. Much better than trusting them to a freezer or fridge.
Again, without knowing for sure what kind of flower they are for sure it's hard to give you a pat answer as to freezer all the time, fridge part time. Some seeds need 2 to 3 months of freezing temps in order to grow properly. Others only need a week or so. Your safest bet because you have such a cold winter is to put them in the freezer for the whole period.
My first choice - broadcasting the seeds as soon as you collect them or before the fall.
My second choice - freezer.
Assumptions do nothing but make an ass out of u and me.
We can stick our heads in the sand for only so long before it starts choking us. Face it folks. The pet population is bad ALL OVER THE WORLD!