Becky, Carpenter's Lily Farm is about a two hour drive south from my house, so yes, Zone 8B. I have been there a couple of times, but it was years ago, when Jack Carpenter was still running the business. I bought just a couple of his seedlings, and the good news was that rust had not shown up yet. I do not know if they now have rust, but they probably spray, just in case--only a guess. I have rust here, not sure where it came from, probably some passalong plant that is now gone, but the damage has been done. I also have two big clumps of Siloam Double Classic, and they do not show rust, thank goodness. Genesta is so impressive, it would seem worthwhile to acquire it and do the trial as to whether or not it will do well in your zone. However, you do want to get a rust free plant, so that probably means getting it from a northern grower.