The vineyard is where it all happens.  The potential of what a wine can be is ultimately limited by what comes to the winery in the grape harvest bins.  There are definitely important things that influence the flavors and textures which are imparted through the winemaking process, but most of the crucial work is done in the vineyard.  Lots and lots and lots of work.  (See the definitions of "slavery" and then "infinity" in the dictionary.)  We know this because we are a family operation and, being scientifically inclined, we understand the concept that work expands exponentially to fill all of time.  And then some.