Wine growing and harvesting: A grapevine produces for 30 years. It takes three years for a young grapevine to begin producing and six years to reach its normal production. Pruning takes place in winter and the vines are sprayed several times a year in order to eradicate the grapevines' enemies: mildew, phylloxera, oidium and vicoses. Artificial clouds protect against frost. Winegrowing methods vary from one region to another. In Burgundy harvesting the stems begins without delay. In the Bordeaux region, however, harvesting takes place over three weeks, especially for the sweet white wines, and the grapes are harvested as soon as the grape reaches absolute maturity, and not before. The workers go from grapevine to grapevine each day picking only the fully ripe bunches to ensure the sweetness of the grapes. They are called "rotis" (roasted by the sun.) In Champagne, the grapes are carefully cut off the vine with scissors and any grape that isn't perfect is removed. The grapes are then tr