The best poppy crop I ever grew was on a sand dune overlooking the lake michigan shore line, I just threw a few hundred extra seeds on the dune and came back a month and a half later totally surprised they were thriving, they loved it and produced tons of latex, No nutes needed nor did I need to water them once. They were the persian white variety .The sandier the "soil" the better IMO, You wont want to go overboard and buy anything more then a bag of sand and cheap no nute miracle grow . I just go out to the apple orchard and dig soil, then go to the beach and get my sand, I strain both and mix it at about a 25% soil to 75% sand mix and have never had a problem with them thriving. My favorate varietys are persian white hens and chicks and the giants. I was not impressed with the tasmainan kind. I was told they are bred to produce thebaine for making pharmaceuticals and (my experience) they lack mostly any kind of codeine or morphine, I believe this to be true, I only ever got a slight buzz from ingestion and more of a headache then anything.