i've been thinking about this every once in while too... I have three locations that I am active in two are subtropical and one is moderate alpine, forgot the zone.... My biggest problem is getting me mitts on the cultivars and/or seeds that could(!) work where I have set up shop. No, I'm not a local plants purist. Where I'm working, it's either deforested or desertified. I would have to experiment anyway to see if the biomes fit. I wish there was an international exchange - plant certificates be damned.