Lees stirring

Lees wine meaning

Lees are the dead yeast cells, grape particles, and fine sediment left behind after fermentation. In wine, lees can add texture, creaminess, and savory complexity when the wine is aged on them carefully.

Lees stirring meaning in winemaking

Lees stirring, also known as bâttonage (from the French word for “stick”), is a winemaking technique performed during sur lie aging where the sediment consisting of dead yeast cells and grape particles is deliberately stirred or resuspended throughout the wine. This process is typically conducted using a wooden stick or specialized equipment, occurring at intervals ranging from weekly to monthly depending on the winemaker’s objectives. The primary benefits include enhanced flavor complexity through the extraction of compounds from the yeast cells, improved mouthfeel and texture through the release of mannoproteins, and increased wine stability. Lees stirring also prevents the development of reductive conditions that can lead to undesirable sulfur compounds and off-flavors such as hydrogen sulfide. The technique is particularly common in white wine production, especially for Chardonnay and other premium varietals, though it’s also employed in some red wine and sparkling wine production. The frequency and duration of bâttonage must be carefully managed, as excessive stirring can lead to over-extraction and unbalanced wines, while insufficient stirring may result in reductive faults and missed opportunities for flavor development.