Why do grape vines shut down? Is it due to the weather? natural vine cycle? Is within a...

Is it due to the weather? natural vine cycle? Is within a way to not agree to the vine shut down, and if so, will it have any denial effects?
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Answers:    It's part of their annual growing cycle, regardless of whether they're grown indoors or outdoors. To force them through winter by growing within a constantly heated greenhouse would stress the plant and might eventually kill it.
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Like the closer answer identified - grapes are one of many plants that require a dormant season (like apples, etc.) which is why some of these plants won't grow within the south. Changes in weather/temperature trigger the plant to initiate shutting down, subsequently causing adjectives the leaves to "change" colors.