03/06/2026
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Why is pruning done?
The basic reason is to remove the bulk of shoots that, having grown taller, can fall between the rows. The physiological implications are summarized here: pruning makes vines more resistant to water stress: the apical leaves are the largest consumers of water. By removing them, the plant achieves a better balance of available water resources.
It contributes to the creation of more balanced wines: cutting the apical leaves blocks growth in height and stimulates lateral buds, which form the lateral or female branches. This shifts the internal balance, reduces overall vigor, and therefore leads to a slight decrease in sugar production, which, however, is better conveyed to the bunches.
It improves the microclimate of the canopy: pruning slightly lightens the canopy, allowing greater light and ventilation to the underlying leaves and bunches, improving overall quality. Furthermore, it avoids humid micro-environmental conditions that favor various diseases.
It rejuvenates the canopy: initially, it actually ages it, because it cuts off the tips with young leaves. Later, however, the stimulation of the lateral branches (female shoots) leads to the growth of many new young leaves, which are highly efficient at photosynthesis, during the ripening process. Those of the main shoots, at this stage, begin to age. Overall rejuvenation helps support optimal ripening, allowing the accumulation in the bunch of all those components that will give richness and complexity to the wine.
Be careful, however: like all agricultural practices, done well is optimal; done poorly, it creates problems.
It is optimal at this stage, immediately after fruit set. If done too early, it blocks the growth of the shoots and limits the canopy (although in some cases, for certain varieties, it has been observed that, if done before flowering, it can improve the fruit set percentage). If pruned too late, its effect on the delicate physiological balance of the vine can be more negative than positive, causing a significant reduction in sugar content and berry weight. For example, in cooler climates, the late growth of female shoots competes too much with ripening berries for the plant's energy, to the detriment of the latter. In warmer environments, however, late pruning doesn't particularly stimulate the growth of lateral branches. You risk removing leaves without any benefits, resulting only in a reduction in leaf surface area.
How much to prune? It depends on your situation, but usually it's a small amount. Generally, avoid overly drastic cuts: we're not pruning an ornamental hedge!
As mentioned, if the canopy is too small, we risk negative consequences. It's been calculated that the bunches of grapes need a sufficient number of leaves above them for optimal ripening (at least a dozen). These leaves above the bunch provide the sugars for ripening. The lower ones send their sugars primarily to the shoots and perennial organs (trunk, roots). If vegetative growth is so intense that it requires significant pruning, it's necessary to consider making other changes to vineyard management, upstream.
Although the care I've explained is necessary, pruning isn't a task that requires excessive precision. For this reason, in a trellis system, pruning can be done mechanically, with a tractor-mounted tool, also because it's very important to complete it quickly, in the short window following fruit set, without overshooting.

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