notes on grape seeds

Try refrigerating for 90 to 120 days(1-5 deg C), followed by warm stratification at 30 to 36 deg C for 2 days then soak in 0.5M hydrogen peroxide for 24 hours, then germinate at 30 deg C with 12/12 hours light /dark. Well drained, moist potting soil or a home blend of 1:1:1 sand:peat:perlite will work fine.

As for timing, once they have sprouted you must be able to provide them with Spring weather, either the real thing or a greenhouse/ growing room. Plant them out well after the danger of frost has passed.

http://www.grapebreeders.org/Gb/Articles/Seed/Seed.htm

Stratification of grape seeds:

The stratification or cold treatment of grape seeds is essential if you want to succeed with growing a grape vine from seeds.

After extracting the seeds from the berries, you need to put the seeds in peat moss or damp paper towel, inside a refrigerator for at least 2 to 3 months. The peat moss must be kept damp throughout the whole process, but not too wet (soggy). The ideal temperature for stratification is 35 - 40 ºF (1 - 3 ºC) and should be kept at this temperature throughout the whole process.

Grape seeds can be held in stratification for a long time (even years), as the seeds will not germinate under these cold conditions.

Planting out the seeds:

After stratification, take the seeds from the refrigerator and plant them in seed pots and ensure the temperature is about 70ºF (20ºC) during daytime. If your climate is cold, you can use heat mats to increase the minimum temperature. Heat up the seed pots at night if your temperature is lower than 15ºC.

After a few weeks (if you are lucky), then some of the seeds will germinate. After the seedling is about 1 - 2 inches high, it can be planted out in a bigger pot. Make sure you keep the soil moist, but not too wet. It is advisable to grow the seedlings in the pots for a full year, before planting them out.