I've shown this clematis before. I think it's worth showing, again. I paid about a buck for it and now I have 20+ plants.
Don't be afraid to try Clematis. I didn't have to do much other than fertilize once in a while. This was in semi-shade and moist ground.
This is my first clematis bloom of the season. The blooms on this are so large. I measured this one and it is 8 inches across.