I know, Sorry, it's confusing!
They grow in every state, nurseries sell them as ornamentals, you can buy the seed at flower shops, on the internet, and garden centers, and they can be found in old neighborhoods everywhere. My grandmother had hens and chicks in a flower bed in her yard, and her friends grew various colors of P.somniferum. I've checked the laws, and they are VERY confusing. Poppys have this quasi-legal status ( only term that seems to apply! ), in one aspect their legal and another they are not. I can and have gone to a floral supply house not far from me and bought them over the counter, tax and all, for arts and crafts ( too expensive! ). I bought 3 plants from a local nursery, potted and perfect. The only thing I know for certain is that if you score the plants ( cut the pods to obtain opium ), you just committed a federal violation. The cuts are very visible, they turn blackish quickly. But most cops have no clue, a friend of mine is the sheriff of my county, and he has been to my home numerous times and has seen my flower beds, my garden, and all he sees are flowers and vegetables! Hell, we sat on my patio with dozens of types of flowers around us, incuding poppys, drinking beer, and no worries. I stay under the radar, discreet, and keep it to myself, and have had no problems. If your smart and keep it low profile, it's fairly easy. So, if you speak legalese better than me, check out the laws and see if you can make any sense of them! I've tried.