What’s the deal with whole bunch ferments?
Whole bunch fermentation is part of the original winemaking process. Crusher-destemmers are a 20th century invention. Prior to their arrival almost all red wines were fermented in whole bunches with their stalks intact, that is, both the main stalk structure of a bunch known as the rachis plus the little bits that attach the berries known as pedicels. Together these stalk components make up between 2% and 5% of the bunch weight and can vary in ripeness and colour from green (unripe) to brown (ripe). In the past, wines made with whole bunches were often rustic and tannic – usually because the stems were green or unripe, but also because an associated reduction in wine acidity increased susceptibility to Brettanomyces.