The main trunk is carried up only to the lower wire of the trellis. At the winter pruning, two one-year canes are selected to be tied along this wire, one on each side, and the two renewal spurs chosen for tying up and new renewal spurs left. For the best production, different varieties require different lengths of fruit canes, but the work at Geneva has not progressed far enough so that recommendations can be made for particular varieties. It has been found best, however, to prune weak vines heavily and vigorous ones lightly. Under normal conditions, from four to eight buds are left on each cane, depending on the vigor of the vine. With some of the older seedlings used for stocks in 1911 which were so large that two cions were used, and in many of those where the roots seemed to have sufficient vigor to support the larger top, two trunks were formed, one from each graft. By spreading these into a V and making the inner arms shorter, very satisfactory results were secured.
The type of growth in Vinifera is different from that of native grapes. The young shoots which spring from the one-year canes, instead of trailing to the ground or running out along the trellis wires, grow erect. Advantage must be taken of this in the pruning system adopted in the East. The canes and the renewal spurs as described above are tied along the lower wire; then the young shoots which come from these grow upward to the second wire. When the shoots are four to six inches above this wire, they are pinched off just above the wire and any which have not already fastened themselves are tied to prevent the wind breaking them off. At the same time, if any of the axial buds on the shoots have begun to form secondary shoots, they are rubbed off, beginning with the node next above the upper cluster and going down to the old cane. This gives the cluster more room and better light. Soon after the first heading-back, the upper buds of the young shoot start lateral growth. The secondary branches usually grow upright and when they are several inches high they are topped with a sickle. This heading-back results in stockier and more mature canes for the following year, and if properly done adds to the fruitfulness of the vine and the fruit matures better.