Are all wild grape leaves edible? I want to use the leaves in some pickles I...
From a nutrition point of view, wild grape leaves are edible. http://www.extension.umn.edu/garden/yard-garden/fruit/wild-and-edible-fruits-of-minnesota/
From a food safety point of view, if the wild grapes are not growing on your property you want to learn about the growing conditions and what the plant has been exposed to. For example, wild grapes could be considered a weed to some people and they might apply herbicides. You need to be familiar and comfortable with the plant's growing season and conditions before harvesting any leaves for food.
For canning pickles, if you remove the blossom end of the cucumber, you don't need to add grape leaves http://extension.psu.edu/food/preservation/news/2012/crispy-pickles
Hope this helps!