I think hardiness zones, height , and width are all relative anyway. Those all depend on what part of the planet one lives on. They could be included in the comments, I suppose. For example Florida's zone 10, and Southern California's zone 10 don't support the same plants due to rains and brief freezes in the different seasons...and on my trip to Hawaii, I was shocked at the size of things like Philodendrons and Ipomeas.
