The question of water has become central in every French wine region. In Burgundy as elsewhere, the challenge is not only to cope with a lack of rain. One must contend with a more irregular distribution of rainfall, more intense episodes, increased evaporation and temperatures capable of altering the vine's functioning very quickly. For the winegrower, adapting the vine to climate change means first of all learning to conserve water better where it falls.

The subject calls for nuance. The vine is a plant able to root deeply and to withstand moderate constraint. That constraint even contributes to the balance between vegetative growth and the ripening of the grapes. But when it becomes too strong or too prolonged, the plant closes its stomata, slows photosynthesis and may halt ripening. The aim is therefore neither to remove all constraint, nor to let the vine simply endure it.

Why is water availability declining?

Annual rainfall is not enough to describe the reality of a vintage. A hundred millimetres falling gently over several weeks does not have the same effect as a violent storm on parched soil. Intense rain can run off at the surface, carry away fine particles and reach the ditches quickly without genuinely recharging the soil profile.

The French Ministry of Agriculture also underlines the role of evapotranspiration: as temperatures rise, water returns more quickly to the atmosphere through soil and plants. Even with a relatively stable annual rainfall total, the water genuinely available during the growing season can therefore diminish.

A living soil acts like a sponge

A vineyard's first water reserve is its soil. Its structure determines the speed of infiltration, the circulation of air and the ability of roots to explore different horizons. Compacted soil lets water penetrate less readily; a well-structured soil, rich in stable aggregates and threaded with roots, worms and micro-organisms, absorbs rainfall better.

Organic matter plays an important part here. It contributes to structural stability and to moisture retention. Returning shredded prunings, encouraging a suitable cover crop or applying organic amendments when analysis justifies it are all possible levers. These choices must always take account of soil type, slope and potential competition with the vine.

Cover crops: protecting without competing

Vegetation between the rows protects the surface against the direct impact of raindrops and limits erosion. Its roots create pathways for infiltration, while the above-ground growth slows run-off. It also supports useful biodiversity. But in dry periods, an overly vigorous cover can consume part of the water the vine needs.

There is therefore no single recipe. Cover can be permanent, temporary, alternated from row to row, rolled, mown or worked superficially. Timing matters as much as the species chosen. The right decision is the one that answers the real state of the parcel: soil depth, vine vigour, slope, weather and production objective.

The canopy protects the grapes too

Faced with hotter summers, canopy management is evolving. In the past, exposing the bunches could help achieve even ripening in cooler sectors. Today, sudden exposure to afternoon sun can cause overheating and scorching. Keeping light shade during the hottest hours is sometimes preferable.

This does not mean letting the canopy close up. Sufficient air circulation and an active leaf surface must be maintained, while avoiding abrupt interventions. Row orientation and the parcel's exposure further modify the response. On a slope, the two sides of a row receive neither the same light nor the same heat.

Rooting, the vine's invisible capital

Old vines are often associated with more developed rooting, but age is not everything. The exploitable depth depends on the rock, on fissures, on clay horizons and on the soil's history. In the limestone terrain of the Mâconnais, roots advance wherever they find a passage and accessible moisture.

Preserving this capital means avoiding compaction, particularly when passing over wet soil, and thinking through mechanical work. A root able to explore a greater volume makes the plant less dependent on surface rainfall. This resilience is built over several years; it cannot be improvised at the onset of a heatwave.

Measured irrigation and appellations: an evolving debate

In June 2026, the INAO announced accelerated work devoted notably to measured irrigation and the adaptation of appellations. The subject is sensitive, because an appellation protects a link to place, collective practices and a product profile. It is not a matter of making water application commonplace, but of considering the exceptional situations in which the survival or physiological functioning of the vine may be threatened.

Irrigation is only one tool among others and never replaces soil quality, rooting or the choice of when to intervene. It also raises questions of shared resource, energy, fairness and oversight. The debate must therefore remain collective, well documented and adapted to each territory.

The practices that strengthen a vineyard's resilience

  • Observe soil moisture at several depths rather than at the surface alone.
  • Limit compaction and encourage good infiltration of rainfall.
  • Adapt cover crops to the water reserve of each parcel.
  • Maintain a functional canopy that shields the bunches from thermal extremes.
  • Think through yield and crop load so as not to exhaust the plant.
  • Compare how parcels respond, in order to build the estate's memory.

Preserving freshness, from grape to wine

Water management is not solely an agronomic question. It is found again in the style of the wine. Steady ripening favours the balance between richness, acidity and aromatic precision. For the Chardonnay of southern Burgundy, this freshness gives the wine its impetus and allows the limestone, the relief and the vintage to stand out.

Climate change obliges viticulture to progress, but it does not condemn the identity of terroirs. On the contrary, it invites us to know them more finely. Every soil pit, every observation after rain and every tasting of berries enriches that understanding. The future of the vine is played out in this patient attention: capturing water when it arrives, keeping it in a living soil and supporting the plant without erasing the singularity of the place.