Good to distinguish the origin of the cultivar. For example:
European and Tasmanian varieties (Blue Seed) do better with a planting in tilled, rich soil just before a long, cold, wet period.
Central Asian varieties (White Seed, Pure Afghan) do better if they germinate sporadically during cold & dry periods.
SE Asian varieties grow fast & finish big in short timeframes. High altitude & moderate temperature with intermittent moisture. Seed color varies, but tend toward blacktop beige.
American & Mexican hybrids have been developed in the high altitude, Sonoran areas or the Sierras. Behave more like the SE Asian varieties (Golden Triangle).
My Advice:
Get a bunch of seeds naturalized to an area similar to your growing conditions, or get a fuckton of poppy seeds from the Asian grocery (white seed & cheap), plant them out in prepared soil at different times of year. Papaver is a quick one to adapt. Buy cheap, plant tons, and incorporate as many central Asian genetics as you can. European genetics stabilize hardiness in the NE USA and extend the vegetative period. Pharma poppies (Tazzie, British) are grown for thebaine (precursor to fent analogues and tramadol). Asian poppies are grown for, well, you know...
Oh, don't plant 'Breadseed Poppies' that are dark seed. Never selected for alkaloids. Papaver is a short season annual. It adapts quickly to human selection.
Also, be careful.