Try this for cold stratification. Lightly moisten some sand & peat mix - barely moist - not soaking. Mix in seeds. Put in crisper for 60 days or so. Then plant in seed trays in a window sill or under lights. Barely cover the seeds.
Outside scratch them into the soil. Barely cover. Mark the area so you do not forget.
I have personally found Purple Coneflower to be easy to germinate and grow. They do NEED cold stratification.
Good luck
