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Exactly who determines what plants are appropriate for what zones? Well, the standard response is horticultural and climatological experts, whoever they are. Even though these climate maps are helpful, you have to think about them as purely a guideline. Gardeners have always been known to test the limits and try something that isn’t supposed to grow where they live. And why not? You may prove the experts wrong.

Traveler beware: If you buy a plant marked as perennial or hardy in the deep Southern United States or California and you live in a chilly northern region, the plant may be labeled such only for the area where it’s sold.