You know what would be really helpful? A worldwide climate zone map. We should petition the UN or some similar agency to develop one AND petition growers/nurseries/publishers worldwide to adopt it. With current globalization and the popularity of sites like ATP, we really should be all "speaking the same language" when it comes to hardiness zones. Linneaus foresaw this centuries ago when he developed the Latin binomial system of plant names and that sure has served us all very well.
