In some northern areas can shrink the skins at the end of the maturity period and burst, which promotes formation of unwanted bacteria. The first fermentation can be controlled only with difficulty, you risk spoilage.
Come as a result of full-color, alcohol and tannin, heavy, rough and hard reds about. For white wines lack acidity, and as a result they work hard, flat and limp, with no grace and little bouquet.
These are the minimum climatic requirements of the vine:
1300 hours of sunshine per year
an average minimum temperature of 15 degrees Celsius during the flowering and 18 ° C during the growing season
annual rainfall of at least 400 to 500 mm / m