Height: – Spread: 8′-10′. ‘Saint Theresa’ is a hardy, purple slipskin grape with excellent flavor, ripening in early September. Even though it is considered seedless, the fruit may still contain a non-viable seed coat giving it just a little ‘crunch’. A table grape variety from Elmer Swenson’s breeding trials in Wisconsin. Train this vigorous vine over arbors. Full sun. Plant Select® 2008. Zone 4.