Last year when we started pruning the Traminette vines, we discovered a couple of vines that clearly were not Traminette. They must have gotten mixed up at the nursery. They are in the same row and about two or three vines away from each other. We have no idea what they are but they are extremely hardy, very fast growing and look absolutely nothing like Traminette. They are massive compared to the other vines in the row. We're going to let them produce this year and try to identify what they are. Maybe they're something weird and unusual like some obscure old heirloom table grape or something we can play around with making crosses. It seems vigorous enough to put on an arbor so maybe we'll take some cuttings and start some new plants to use near the house.
Here's what it looks like.