I "tossed" out "Persian Blue" poppies last fall and just had a great show. I liked them so much that this year I'm doing several different kinds of somniferum poppies. Also traded for some wood poppies (will grow in shade) and California poppies have naturalized in my garden. I think the fall sowing is what did it. Some seeds just need to be outside for the winter and then come up when they decide to.
If you'd like to try some "Persian Blue", I have tons of seed I collected.