Seyval Blanc Seyval Blanc Overall Impression Seyval Blanc is a good choice for cool climates as it ripens early and is quite productive at cold temperatures. Wines from this variety are crisp and clean and can benefit from barrel maturation. Yeast Strain to Use: 4021 Dry White/Sparkling View Strain 4028 Red View Strain 4783 Sweet White View Strain