PART 1: Selecting Your Grape Seeds. Obtain the grape seeds. Different types of grapes thrive best with different soil pH levels (5.5-6.0 for natives, 6.0-6.5 for hybrids, and 6.5-7.0 for vinifera), so it is best to either plant in an area with a pH level in the right range, or adjust your soil's pH before planting.