Counting degree days may be a useful exercise when selecting a vineyard location, but it’s less profitable when you’re trying to figure out when to harvest the grapes the site has produced. “Degree days are not telling you the whole picture,” Dr. Mark Greenspan told growers at the annual viticulture conference hosted by the B.C. Wine Grape Council in Penticton, British Columbia, Canada, in July. “Generally speaking, degree days don’t have a lot to do with the ripening process.” While a correlation exists between growing degree days and the time it takes for vines to reach bloom, Greenspan has found […]