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Have you ever wondered why grape vineyards are often picked or harvested at night? In this video, I will explain the reasoning behind picking grapes in the dark of night. The primary reason you would pick grapes at night is to take advantage of the cooler temperature of the night air. This helps trap the aromas of the grape and preserve them for the wine. Another reason that wine grapes are often harvested in the cool night air is to prevent the risk of spontaneous fermentation. If the juice is very warm at the time of crush, wild yeast and bacteria have a better shot at fermenting those grapes. The third reason you might pick grapes at night is to take advantage of the stability achieved during the more comfortable temperatures. In the sunlight on a hot day, the grapes can slightly dehydrate which can drive up the sugar content. This change in sugar content might be unwanted by the winemaker.
