The collection of 6 poppies that I ordered from American Meadows 10 years ago ,were all bare root. They came in spring and had to develop until the next season .The "roots " were smaller than a pencil and several were mushy and didnt make it. When I moved here 7 years ago I bought another collection but I think those were from a co-op. Pattys Plum was among them.
OP's in pots are always a better bet. I am wary of bare roots as they are sensitive.