Bordeaux Supérieur wines tend to be richer and more complex than regular Bordeaux; Vineyards producing Supérieur wines must have at least 4500 plants per hectare with at least 2.2 meters between the rows. Vineyards producing regular Bordeaux wine are required to have only 4000 plants per hectare, separated by a more generous 2.5 meters. The maximum yield per hectare obtained from the vineyards is also 10 percent lower for the Supérieur wines, 9000kg for reds and 8000 kg for whites. The grapes must also be measurably riper when it comes to harvest time, with an extra 0.5 percent potential alcohol over those used for regular Bordeaux wines. Finally, Bordeaux Supérieur wines must age for at least 10 months before being released into the market.