Summary: Join winemaker Olivier Humbrecht MW, of famed estate Zind Humbrechtin Alsace, for a deep dive into these key components of winemaking: yeast and fermentation!  Presenter: Olivier Humbrecht, MW Olivier Humbrecht studied wine together with wine marketing and wine business for five years in Toulouse, and then got the chance to do his ‘military service’ working for

After several months of dormancy, the first signs of the new vintage begin to show in March (in temperate to warm climates). The fresh pruning wounds begin to “bleed.” This initial sap flow is triggered by rising temperatures. Shortly after the bleeding stops, the buds will begin to swell.

In October, most areas of the northern hemisphere are in harvest and going full out! Many white varieties finish in early October. Although some reds (particularly early-ripening Pinot Noir) may have started harvest in September, generally, October is the month when most red varieties are picked.  In September’s post, we explored the harvest parameters for white grapes.  The factors that a winemaker considers when picking red grapes are similar… flavor, acid, sugar, etc.  However, there are two key harvest parameters that are more important (and impactful) for reds than whites: tannin ripeness and anthocyanin accumulation (color). 

Now that fall has arrived, winemakers turn their attention to the harvest. In most of the northern hemisphere, harvest usually begins by the middle of this month, if not earlier.  It is an exciting time. The culmination of all the hard work in the vineyards is realized in the moments the grapes are picked.  Vineyard managers can relax now, but the winemaker’s job is just getting started.