That's an amazing poppy Fubar! Never seen one that big (I bet you used to get told that all the time

).
As well as planting the preceeding Autumn would you also recommend growing the plants singly like you have done above? Im sure that the mistake i made during the one year when i had 100% perfect weather conditions right the way through was just trying to cram too many into small an area, so that each individual plant did not have enough space or spare nutritious soil to reach its full height, and for the pods to reach a good size and hopefully mature virtually dripping in Alkaloids.
The plants were growing like a lawn of grass initially, even though i had consciously made an effort to sow them thinly, meaning that i had to spend a hell of a lot of time over the following months thinning out huge parts of the growing areas, and then later any runts, stragglers, or slow growers would also get sacrificed for the greater good. All in vain. Except as a learning process, of learning by doing, and learning by my mistakes. All is far from lost in that regard as I have acquired a great deal of knowledge and experience which hopefully I will be able to put to good use at some point, later in my life.