Sylvaner, known as Johannisberg in Valais, is the second most widely planted white grape variety in Valais. It is sensitive to disease and cold, but is nevertheless a vigorous plant. Sylvaner is so at home on soil that is light, shistose and gravelly, in particular on dejection cones, that cantonal legislation dictates where it can be planted. It is ready to harvest slightly later than Chasselas. Its potential for aging and for developing greater complexity are startlingly good—well beyond 20 years!