I have divided the poppies that were in my fridge for a week. Both varieties came with plenty of seeds and I just was itching to do the "milk bottle guardian" thing. so a few seeds for experiment.
I used plant stem supports to keep the bottles from rotateing in the wind and undoing the seeds.
This is not "winter sowing" Jugs have no bottoms and act as terrarims- guardians to keep birds from eating seeds
Of course after I got the seeds sowen I forgot which was wich.