Conversations with Carlo: whole cluster fermentation of Pinot Noir
Carlo Mondavi, whom I got to know and like last year in Kapalua, emailed to bring me up to date on his new project, RAEN, a Sonoma Coast Pinot Noir he’s making in collaboration with his brother, Dante.
His email prompted me to ask him some followup questions, which led to an exchange I thought is interesting enough to reproduce. The subject is Pinot Noir, and the role of stems in the fermentation.
Carlo had sent me this video of him and Dante making the wine. Along the way, Carlo says, concerning the whole-cluster fermentation he enjoys, “I can smell the greenness of these stems, they’re super-green.” My ears perked up at this, because I had thought that you don’t want green stems in the fermentation, you want brown, ripe ones, in order to avoid passing on that green, vegetal aroma and harsh tannins to the wine. So I asked Carlo, “If you whole cluster with green stems doesn’t that make the wine taste and smell green?”
He replied, “I…believe that the stems being green and thus under ripe or ideal is a complete misconception.” His response is worth quoting in full:
“In fact DRC and most of the best whole cluster examples are harvesting when the stems are electric green. This also means most likely and certainly for us that the sugars are lower and the extraction of bitter flavors will be lower. We also take into account sap flow…
“I believe that sap flow is greater in certain clones and in certain sites varying vintage to vintage… There is no perfect map so we go on taste and observation… To determine the amount of whole cluster vs destemmed fruit we ferment we run a quick tasting. We take the stem sans fruit, cut it up, put it inside a pastil bag and squeeze the sap out. We then observe the sap (how much, how sappy) then taste the sap to see how astringent it is. From there we make decide if we will use some, none or all of the whole cluster.… This past vintage we certainly used a great amount of whole cluster as it was a new moon and the sap seemed to much less than what we might have seen on a full moon.
“Thirdly I also like the balance of bitter and sweet… Stems add potassium and tannin to a wine and can balance the overly strawberry, cranberry, rhubarb fruit flavors… to me it gives the wine a middle palate of velvet and structure and in some examples and slight elevation of minerality.
“Waiting for full brown clusters is a major mistake in my opinion… If you wait that long you are looking at harvesting well north of 25 brix of sugar and in December in some sites. This would yield a wine of incredible bitterness and a PH that would be certainly unfermentable and unstable naturally. With that said where we make our cuts is where the rachis meets the shoot this area is brown and lignified. We make our harvesting cuts right in the middle of this browning area to minimize sap flowing out into the juice.”
Still puzzled, I asked Carlo, “In a vintage like 2011, I found some coastal Pinots to have a green, minty edge. So, where does that come from?”
Carlo: “Huh… That’s a Good question. I would think some stems, the local terroir and for late harvesters, botrytis… I see a bit of botrytis each year… Pinot noir clusters are so tight it just seems to happen when the heat comes after the rain or In some vintages with the humidity… With that said green can be no stems with green seeds or Rosie’s, tough under ripe skins or jacks… I have tasted de stemmed and 10 percent whole cluster wines and found them be more green than 100 percent whole cluster wines depending on the site and vintage… I also enjoy wine that can have a slight green note… I don’t see green to be bad so long as it is not over the top… Just like anything.”
I’ve never felt that whole-cluster fermentation is better than destemming, or vice versa. California Pinot Noir can be delightful either way. I do feel, as does Carlo, that stems can give Pinot Noir a fuller body and more tannins, not to mention spiciness. Still, I’m not quite convinced that green stems do not bring a green note to cool-climate Pinot Noir, and I’d love to hear the opinion of others.
This is one of the wine taster’s biggest conundrums: it’s easy to detect something in a wine but a lot harder to identify exactly what causes it. When I was a reviewer, I tried to avoid attributing specific results to specific causes, if I couldn’t be absolutely sure about the connection. Asking winemakers to explain can sometimes clear things up, but sometimes it can make you even more confused. Which is why I was always happy to leave the winemaking to the winemakers, if they’d leave the wine reviewing to me!