Curious how many growers strictly follow USDA climate zone guidelines for vines (i.e. live in zone 5 and plant vines suitable for zone 5, 4, and 3), how many err on the side of caution due to increasingly anomalous brutally cold winters (i.e. live in zone 5 but only plant vines suitable for zone 3), and how many throw caution to the wind and plant varieties that may be a little too cold sensitive for their particular zone? With the last one, I read that one grower in Vermont is growing Riesling. Not sure how that survives winters there.