Grapevines, which are hardy down to USDA zone 3, depending on the specific cultivar, provide more than just ornamental vegetation in a backyard landscape. They also produce a profusion of plump, colorful fruit. Though many garden stores and nurseries sell ready-to-plant grapevine seedlings, sowing grapevine seeds is a cheaper method of starting your own vines.
Moisten the peat moss with water so that the moss is moist to the touch but not so wet that it's dripping.
Place the peat moss in a plastic bag that seals. Bury the grape seeds in the moss. Seal the bag and put it in your refrigerator. This stratifies the seeds and mimics the coolness of winter, helping to bring the seeds out of dormancy. Leave the seeds in the fridge for 60 days, according to North Dakota State University.
Prepare the seed pots while you're waiting for the seeds to stratify. Prepare one quart-size pot for each seed that you want to plant. Fill the pot with sterile potting mix, available from most garden stores. Add enough potting mix so the soil is an inch below the pot's rim.
Plant the grapevine seeds after the 60 days of stratification are over. Place one seed in each pot. Since grape seeds need light to germinate, North Dakota University doesn't recommend burying the seeds deep. Instead, simply place the seed on the surface of the potting mix and tap it with your finger to submerge it slightly.
Water the pot. Use a spray bottle to mist the soil surface to avoid washing away the soil from around the seed. Mist twice a day or as needed to keep the mix consistently moist. The seed will germinate in three to four weeks.