Three years ago I took cuttings from an old (probably pre WWII ) vineyard that was going to be destroyed. No one knew what kind they were but I guessed they were concord since they were over 70 years old and growing in Minnesota. This year they have grapes and I just tasted one and I was shocked to discover that it was seedless. Is it possible that there is a seedless concord or is there another grape that looks and grows like concord?