I bought this one last year to try because of its rust resistance score of 1.0, and so far it has lived up to that. It has grown beautifully here, putting out lush foliage. It is a true evergreen here in 8b. It has not yet bloomed, and when it does I will update.
Later: Witch's Thimble is blooming, and it is sure a cutie. It continues to do well with no rust so far. It's taller than 18". It's also pod fertile.
Blooms are cream-colored. I am hoping future blooms will lighten, but I am very happy with this plant.