You can find Geranium 'Rozanne' and Clematis 'Etoile Violette' at Platt Hill Nusery (platthillnursery.com) in Carpentersville, IL, and the coreopsis at Garden Crossings, a mailorder nursery in MI.

Here is a link that might be useful: Garden Crossings

Thanks! That is very helpful.

Not about those particular plants but there are several excellent nurseries in WI, Milaeger is one I visit often. Geimer Nursery Long grove, IL is good and big- there are several of them located close to each other.

I have no knowledge about where you can get these particular varieties. But I do know of a mail order company that my mother and I have purchased from for at least 40 years. It is Jungs in Randolph, Wisconsin. They are family run and have been in business for at least 100 years. They do have a web site that is OK but their catalog is great. I would recommend them. They also have a nursery in Madison which I have never gone to.

I realize it's too late in the season, but I've found the best way to grow rarer plants is by sowing seeds..Especially annuals.
When I look for something special to add to my garden, it seems all stores carry the same plants..nothing unusual..and if you do happen to come across something rare, it's way overpriced..
Plant Nanny, I agree w/you about Jungs..they sell interesting plants/seeds..been ordering from them for yrs. Henry's used to sell about the same plants/prices as Jungs. Can't recall where it's located..
For those of you who live in northern Il, Jamacan Gardens sells a good variety of plants..there's one in, I believe, Libertyville, the other in Morton Grove..I love shopping at both nurseries..Toni