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Vigor is the ability of the grapevine to grow and create new leaves. The rootstock of a grapevine can inhibit or stimulate growth. Too low a vigor can ensure that the grapevine does not grow large enough (and does not reach the top line), but a too high vigor can prevent a good fruit set from taking place, for too many nutrients will go to the growth. To achieve a balanced growth for each grape variety, the choice of rootstock is crucial and depends on the vigor of the grafted grape variety, the climate and the soil.


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