Vickie - You know if you do have large clumps, I would think it could be a possibility that the rust is indeed surviving hidden in some of the plant tissue. But I am no expert. If you ever need to divide Lady Neva, I'd sure be willing to take a fan or two off your hands!
What lies behind us and what lies before us are tiny matters, compared to what lies within us. Garden Rooms and Becky's Budget Garden