Wild grapes that ripen on the vine produce the most viable seed. Clean viable seed dropped into a glass of water will sink. Seeds that float are dead and will not germinate.
Wild grape seeds require 60 or more days of freezing weather before germinating. After gathering the seeds, wrap the cleaned seeds in a paper towel moistened with water containing a small amount of fungicide and place in a plastic bag. Store the wrapped seeds in the freezer for a few months and then move them to the refrigerator compartment until spring.
Wild grape seeds sometimes remain dormant in the soil for years, waiting for the right conditions to germinate. In addition to a period of cold weather, they need full sunlight to sprout. Seeds on the soil surface have a better chance of sprouting than those buried beneath the surface or covered by leaves and debris.
Most wild grapes are hybrids, the result of cross pollination from two different vines. The resulting seeds are a mixture of the male and female plants and will have characteristics of each. The new plants may not produce as well as the parents.