It takes a whole lot of nerve and very close observation. We have to be ready for anything. We search out the few books or pamphlets that deal with exotics and hope we ll recognize our own kind in there and find helpful instructions. We talk to older gardeners who have lots of experiences with lots of exotic flowers and hope that they'll recognize the characteristics we're observing and will be able to offer advice about what has worked for that sort of exotic before. And meanwhile, we watch closely, follow our instincts, do what seems right.
Nature is the foundation.
But if it is dumped on a parking lot and ignored it isn't likely even to germinate, let alone grow. Important as nature is, nurture is critical too.