Once upon a vine. Grape fanciers¡ªand we are many¡ªare smitten with this delectable early-season purple grape.? Virtually seedless, 'St. Teresa' produces an abundance of great big clusters of sweet, flavor-rich slip-skinned fruit in early September.? Vigorous vines flourish prettily on arbor or screen. A top table grape from Elmer Swenson's legendary breeding program in Wisconsin, self-pollinating variety is cold-hardy to -30 F. Low to moderate water needs; tolerant of alkaline soil.