The small, white oval berries of this century-old release from Cornell ripen very early, coming on at least six weeks before Concord. Though not seedless, most of the excellently sweet, spicey-flavored berries have only one seed. The quality of the fruit is somewhat offset by faults of the vine. For one, it is more susceptible to powdery mildew than any other American grape. It tends to alternate between light and heavy crops. Its vigor is on the high side, so Seneca must be pruned to canes as spurs are not productive. Seneca’s flavor is so good it’s still worth a try. Cold hardy to warm zone 5, so a bit of a risk at higher elevations in our region.