I have purchased some "bulbs" of Iris dardanus thinking that they were like other Dutch Iris that I have planted. When I opened the brown paper bag they came in I realized that these resemble more of a typical bearded Iris rhizome, which I would plant nearly on the surface. Can someone tell me how these should be planted? On the surface or not? If not, how deep? I assume the rhizome should be planted horizontal to the surface like a bearded iris. The packaging said full or partial sun. What I have since read suggests the more sun the better and that they like to bake in the summer sun. Cultivation pointers appreciated. Bob Hoel Chicago area