Leaf thinning of the vine is one of the gestures that punctuate summer in our Pouilly-Fuissé vineyard. After the active growth of spring, it is a matter of intervening with precision around the clusters, without ever forgetting that each Chardonnay vine must retain its balance. In Solutré, where the limestone soils, relief and exposure create varied situations, this work above all requires observation.

At Domaine Pascal Renaud, we consider leaf thinning to be an adaptation to the conditions of the vintage and of each plot, not an automatic operation. The vigor of the vine, the density of the foliage, the health of the clusters and the forecast weather guide our decisions. The same gesture may be useful in one row and unnecessary a few meters further on.

Why practice leaf thinning of the vine?

The leaves surrounding the clusters naturally form a protection. They shelter them from direct sunlight, contribute to the plant's overall functioning and create a microclimate within the vegetation. When this cover becomes too dense, air circulates less well and moisture can remain longer around the grapes after rain, dew or a stormy spell.

Leaf thinning consists of removing a chosen portion of these leaves in the fruiting zone. The aim is to aerate the clusters and promote faster drying of their surroundings. This opening also makes it easier to move through the vines and to observe the state of the grapes: a visible cluster is easier to monitor than one hidden beneath abundant vegetation.

This work is therefore not intended to widely expose the grape. It seeks a fair balance: enough opening to improve ventilation, enough foliage to preserve the clusters and allow the vine to continue its activity under good conditions. This is an essential nuance, particularly for Chardonnay from southern Burgundy.

When should Chardonnay vines be leaf-thinned?

The timing of the intervention depends on vegetative development and the weather of the year. Generally, leaf thinning takes place after the clusters have formed, when the vegetation is sufficiently developed to assess its density. It does not follow a fixed calendar date: the season progresses at its own pace, sometimes quickly, sometimes more slowly.

We favor days when conditions allow the vines to be worked with care. After a rainy spell, for example, observation is particularly important: vigorous vegetation can quickly close the space around the clusters again. Conversely, during heat waves or a very dry period, too marked an intervention can increase the grapes' exposure.

In our Pouilly-Fuissé plots, differences in altitude, orientation and soil depth can alter the vine's behavior. A cooler or more fertile area does not necessarily call for the same approach as a more free-draining slope. This is why regular passage through the rows remains irreplaceable.

A measured gesture in the face of sun and heat

Sunlight is necessary for the vine's life, but abrupt exposure of the clusters can weaken them, especially on very hot days. The berries, until then protected by the leaves, must not be laid bare without discernment. The risk of sunburn is a reminder that leaf thinning is a precise gesture, not a simple clearing of vegetation.

The position of the leaves removed matters as much as their number. Depending on the orientation of the rows and the sunlight exposure of the plot, we seek to leave the clusters with protection suited to the hottest hours. Manual work allows the gesture to be adjusted vine by vine, taking into account the grape load and the vigor observed.

In the vineyard, balance is often built through small decisions: open a little, protect further still, then come back to observe.

This attention is particularly important on the limestone terroirs of Solutré. Their capacity to retain or limit water, the slope and the soil's reserve influence the vigor of the foliage. Leaf thinning is thus part of an overall reading of the plot, alongside shoot positioning and the management of grass cover.

Leaf thinning, shoot positioning and trimming: complementary tasks

These terms refer to different interventions, even though they often follow one another during the season. Shoot positioning consists of guiding the shoots between the trellis wires to maintain upright, orderly vegetation. Trimming reduces the ends of shoots that have become too long, while leaf thinning acts directly around the cluster zone.

Together, these gestures help organize the plant canopy. A well-managed vine allows for better circulation through the rows, more precise observation and a more harmonious distribution of vegetation. They do not replace vigilance: each operation must remain proportionate to what the plant expresses that year.

  • Shoot positioning keeps the shoots upright and prevents them from falling into the inter-row.
  • Trimming limits excessive lengthening of the vegetation.
  • Leaf thinning aerates, with restraint, the space around the clusters.
  • Health monitoring allows these choices to be adapted throughout the summer.

Leaf thinning in the life of the estate

Summer is a period when the vine changes appearance rapidly. Within a few weeks, the shoots develop, the clusters gain volume and the rows become denser. Leaf thinning is one of those tasks that may go unnoticed by visitors, but which is essential to our daily presence in the vineyard.

It requires patience and a thorough knowledge of the plots. Moving row by row, we rediscover the particularities of our named plots: a more vigorous area, a section better ventilated by air currents, a less uniform vine or a cluster to watch closely. This knowledge of the land nourishes the choices we make for our cuvées.

The work is also collective. It relies on shared gestures, on the watchful eye of those who walk through the vines and on exchanges about the season's progress. Within a family estate, these daily observations create a very concrete continuity between the Solutré landscape, the care given to the Chardonnay and the wines that will later be born in the cellar.

A decision that cannot be reduced to the weather

It would be tempting to reduce leaf thinning to a response to humidity or disease risk. In reality, the decision incorporates many factors: the state of the clusters, the level of foliage, water availability, weather forecasts and the behavior specific to each plot. The weather provides a framework, but it never excuses us from going to see the vine for ourselves.

A well-reasoned intervention does not on its own guarantee the quality of a wine. It helps create favorable conditions to accompany the grape through to ripeness, with consistency and respect for its origin. It is this accumulation of care, far more than any single gesture, that matters in tending our vineyard in southern Burgundy.

How do you know if leaf thinning of the vine is necessary?

It is necessary when the cluster zone is too closed and air circulation becomes insufficient. We assess this directly in the rows, observing the density of the foliage, the health of the grapes and their exposure. The aim is never to apply a fixed rule, but to give each Pouilly-Fuissé plot the most fitting response.