Concord Seedless GrapevineConcord Seedless is a seedless sport of the classic Concord grape, featuring clusters and berries slightly smaller than the original. This blue black grape matures earlier than Concord, delivering excellent flavor ideal for pies and preserves. With moderate vigor and a trailing growth habit, Concord Seedless thrives in USDA zones 4 8. While its highly susceptible to Black Rot and sulfur sensitivity, it has slight susceptibility to Downy Mildew and