Viognier wines are well known for their floral aromas, and terpenes, which are also found in Muscat and Riesling wines. There are also many other powerful flower and fruit aromas which can be perceived in these wines depending on where they were grown, the weather conditions and how old the vines were. Although some of these wines, especially those from old vines and the late-harvest wines, are suitable for aging, most are intended to be consumed young. Viogniers more than three years old tend to lose many of the floral aromas that make this wine unique. Aging these wines will often yield a very crisp drinking wine which is almost completely flat in the nose. The color and the aroma of the wine suggest a sweet wine but Viognier wines are predominantly dry, although sweet late-harvest dessert wines have been made. It is a grape with low acidity; it is sometimes used to soften wines made predominantly with the red Syrah grape. In addition to its softening qualities the grape also adds a colour-stabilizing agent and enhanced perfume to the red wine. In the Rhone region, the grapes normally are not affected by the fungus "Botrytis cinerea" though botrytized Viognier is not unheard of.