I'm sowing mine in October/November. I had my first real luck with somniferon poppies by sowing them in the fall last year. California poppies (I'm in California) actually seed earlier than fall and here you can pretty much put them in anytime (they don't need a frost). I've never had any luck with corn poppies or Icelandic poppies. Maybe it's my frost free environment is just unsuitable.
"Poppies will make you sleep"
