Take grape cuttings from a well established vine that is woody and not green. Collect them anytime in December or January. Cut your selected branches at an angle using a hand-held pruner.
Cut the branches into 9 to 12-inch segments that have four or five nodes each. Cut just above the top node at a 45-degree angle and use a straight cut just below the bottom node. Prepare each segment by soaking the bottom end in a bowl of water for five minutes, and then dip the soaked end in rooting powder.
Fill a sixteen inch plastic pot with a two inch layer of small rocks to help with drainage; use pots that have holes in the bottom. Pour soil mixture of equal parts sterile soil and perlite around the cutting while holding it upright in the center of the pot. Firmly press the dirt down around the grape cutting without packing it down too much. Only about 1 or 2 inches of the cutting should be visible with one node above the ground. Water each pot thoroughly until water runs out of the bottom of the pot.
Keep the soil of the grape cuttings evenly moist at all times by watering them three or four times per week until the roots are well established. Keep them warm indoors or use a heating pad under the pots.