That will resolve how close each vine is planted to the others. Good grapes need nutritional stress. If the vines are planted as close as one yard between each other, the competition for soil nutrients will result in better fruit. You ll get fewer grapes, but they will be of a better quality. Where grapevines are concerned, you want high density when the soil is less fertile.
Growth is controlled by pruning, which is done in either of two ways.
After the growing season, all of last season s shoots are cut off. Enough potential shoots are left to grow next year s grapes. Another type of pruning called green harvest , involves cutting bunches of grapes from the vine before they ripen. That way, the remaining grapes can get the nutrients that would otherwise have been shared with the castaways. That s your basic course in viticulture.