Just as I was about to start harvesting these for freezing, I noticed
two things:

1) There wasn't a wild grape to be found on any vine anywhere.

2) Some of the grape vines had more ridges around the edge of the leaf
than the normal I'm used to seeing on grape leaves. Discretion being
the better part of valour, I decided not to pick any of the two types
but instead file them under the category of better safe than sorry.

Would anyone know if, when, and under what circumstances wild grapes
fruit and if all wild grape varieties are edible?

Karen