Take grapevine cuttings in late winter when you prune your vines. Cut sections from canes or vines and include three to four growing nodes on each section. The length of the cutting is unimportant as long as it contains buds. Trim the cutting so that the bottom cut sits 1 inch below the bottom node, and the top cut sits 1 inch above the last node. Make the top cut at a 45-degree angle.
Fill a 5- to 10-gallon pot with quick-draining potting or starter soil for a fine, loose foundation. Fine soil makes new root growth easier and more efficient. Plant multiple cuttings in a single pot, with their bottom nodes buried and middle nodes at soil level. Leave at least one growing node exposed for new growth.
Put the pots in a shady, protected and relatively warm environment. Grape cuttings take root quicker in humid areas. Water the cuttings with 1 to 2 inches of water every week.
Move the grape cuttings outside after they take root and produce new growth at the exposed nodes. Move them into the vineyard only after they grow established root balls.