Since dahlias are native to Mexico, it’s not surprising that they can’t survive our winters here. What makes them so popular with northern gardeners, however, is the fact that they grow from tubers, which we can dig up and store inside during the winter. This makes them “perennial” in some respects, because we can grow the same tubers year after year. But they’re annuals in that we have to replant the tubers outside every spring.
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