Summer pruning—Allow only one strong leader to develop from the end of each main framework branch without pruning it and stretch and attach this shoot along the support. Cut off the ends of all new side shoots just beyond the sixth or seventh leaf as soon as that leaf develops. New shoots will form as a result of these cuts. As they do, cut them back as soon as only one or two leaves develop.
Late winter pruning—Cut unpruned leader shoots back to one-half or two-thirds their length. Cut side shoots pruned the previous summer back to only 1 to 2 inches from their base for short flowering spurs. This method of pruning allows permanent framework branches to extend each year by half the annual growth and side shoots to become short flowering spurs.
Maintenance pruning—Once the vine has been trained into the allotted space, follow summer pruning practices as outlined above. In winter, prune leader shoots back to only four or five buds. Remove any suckers that appear at the base of the plant.
Pruning neglected vines—In winter, prune away all but a framework of branches. Shorten these drastically, removing crowded and poorly spaced branches. Then follow pruning and training methods for a new vine. Hopefully, the plant will bloom within two or three years. Train the main leader to the upper part of the support system and cut it off when it reaches the desired height. Train main side branches as needed so they are spaced about 18 inches apart. Once the vine fills the allotted space, follow summer pruning practices.