Grape, 1 gal, FrontenacFrontenac is a wine grape derived from the grape breeding program at the University of Minnesota. One of the most cold hardy varieties. It's very disease resistant, with near immunity to downy mildew. Frontenac is a consistently heavy producer, with small, black berries in medium to large cluster. Attributes Type: Fruit Vine Fruit Size: Clusters (1cm) Fruit Colour: Bluish red Height: 2. 5m (8 ft.) Spread: 2m (6 ft.) Zone: 3 Sun Exposure: Full Sun