If you lived there for a while and the plant is relatively new it's some random wild grape plant.

Im new to the place last year, which is when i first noted it. There were a lot of things planted here already (peach tree, lilies, roses, gladiolus, etc) so it would make sense that they also had planted grapes.

Then you just have to wait and record the week the favor was best, the color, size, vigor of the plant, seeds or no seeds, density of the bunches.

There are just too many varities to say something like "oh that leaf is from a xxxxxx"

I can't tell you what it is, but I can tell you what it isn't... It isn't a Concord and it isn't a Muscadine.

Oh bummer.... love me some concords...