The Sundown varietal is not a well-known term in the world of either botany or viticulture. It's possible that there might be some confusion with the name. However, there are various plants and grape varieties that have 'sundown' in their names, such as the Picea pungens 'Sundown' (a type of spruce tree) or the Sundown Orange Coneflower (a variety of Echinacea). If you could be more specific about the context (for example, what product or plant type this varietal is related to), it would be easier to provide a thorough and accurate description.
