Wow! What a Poppy!
This had one bloom last year, but nothing like this one. (And there are a few more developing!)
Perennial poppy. I think it was sold as a "California Poppy" but I don't know the species/cultivar name. Anyone know?
Oh, and that is a 5-1/4" board behind it in the first photo, just for sizing. The reproductive parts there are nearly the size of a golfball.