Tag Archives: Certified Wine Educator

Wild versus commercial yeasts

Oh, regrets.

The following is a timed essay that I did as practice for my upcoming Certified Wine Educator exam. I was halfway through the total allotted time (60 minutes) when I realized that I should have structured it to be compare/contrast wild and commercial yeast by topic rather than the clumsy way I did it here (which was everything-about-each-yeast-separately).

Yum. Yeast.

I guess that is why I practice.

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What is your take on the cultured vs. wild yeast topic? Is the claim of “wild yeast fermentation” valid, or does cultured yeast dominate the wineries of the world to the extent that wild yeasts are subdued?

A 2013 study by the University of British Columbia found that spontaneous fermentations with so-called “wild” yeasts were quickly overtaken by commercial yeast strains from the air, and these stronger strains could complete the fermentations to dryness. There were some flaws in the study, but the subsequent reporting raised the question: do wild yeasts matter?

It is an important question as many wineries claim to use ‘wild’ or ‘native’ yeast and use this as a marketing point of differentiation, yet this study, and other anecdotal evidence around the world, found that even without inoculating, the stronger, commercial yeast strains dominate fermentations. Commercial yeasts (generally Saccharomyces cerevisiae) are available for sale from any oenology store. These yeasts have been separated out by a microbiologist for various traits, multiplied, packaged and sold ready to add to your must. Wild yeasts, on the other hand, are native to a particular cellar. They live on the equipment, in the vineyard and in the air. The wild yeast are from other strains and oddly enough, the discussion of wild versus cultured has been so significant that oenology companies are now culturing wild yeast strains for sale.

Cultured yeasts have been an input to winemaking since Pasteur discovered the cause of fermentation in the 19th century. Many winemakers today will use cultured yeast for their specific properties (low foaming, low VA production or maybe tolerance to high alcohol) and it is this predictability that make cultured yeast so relevant. Being predictable means that the winemaker can control the quality and expression of the vineyard a little better. The winemaker at Smith-Madrone has said that he used wild ferments on his Pinot Noir for over 35 years before switching to cultured yeasts and cited that the cultured yeast allowed for a more pure expression of fruit.

Of course very few technical sheets or winemakers will openly cite what strain of commercial yeast they are using (but they would be open about other things like, which forest they get their barrels from) as it interferes with the consumers’ romantic notion of winemaking. There is also a fear of standardization: could wines that use the same yeasts (which impacts fermentation kinetics) start to taste the same?

Wild yeast fermentations certainly add complexity to a wine partially due to the different metabolites of these yeasts. Fermentation kinetics will also be different (might be slower to start and warm up) which will impart their own characteristics. Wild yeasts, when taken from the native environment, certainly saves money for the winery, which must be considered, and the romantic notion that wine is merely grapes carefully guided to the bottle will stay intact.

But most truly wild yeasts (non-Saccharomyces cerevisiae) have many drawbacks, mainly, that many of them die around 4-6% alcohol, implying that, even if a cellar has never had a packaged yeast brought into the area, Saccharomyces cerevisiae must finish the job anyway. This reason alone leaves the question of using a commercial yeast, which has the least amount of risk, as a no-brainer, but also that most aroma differences in wines made by wild versus natural yeasts are lost within the first 12 months, so again, why bother?

Knowing that a microbiologist can very easily separate our any yeast strains and reproduce it to use for a fermentation, it should be acknowledged that all yeast could really considered to be wild. Some have just been ‘tamed’. Also consider that the human hand is as much a part of the definition of terroir as the soil, the climate or even the grape variety. The winemakers’ job is to not destroy the individual terroir of the wine. If a wild fermentation starts to generate high amounts of volatile acidity because the yeasts are sluggish to get fermentation started, is this volatile acidity interfering with terroir or part of it?

In the end, it seems that the debate of wild yeast versus commercial yeasts is a philosophical debate. Studies have proven that wild yeasts and commercial yeasts co-exist in many fermentations and contribute their own positive and negative aspects to a finished wine, so the choice depends on the style of wine you are making and for what commercial segment of the market.

CWE practice essay: Biodynamics

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This is probably a terrible idea.

So I should definitely do it.

As part of my preparations for the Certified Wine Educator exams, I am going through their online course which is essentially the book club, logically organized all in one place. This course covers many books I’ve been meaning to read and includes exercises (including the essay below) and online quizzes.

I spent five mins brain-dumping and a few more making a brief outline. The red and blue words are the editor’s suggestions.

This was my first timed essay (30 minutes)…in its raw form. I actually took the essay over to fiverr.com and for a grammar check and critique (and learned that I used the word “includes” a lot). It’s no small investment ($12 for this essay), but how can you improve without getting feedback?

To be clear, this was done closed-book in timed conditions (do you also apologize before showing your unpolished work to someone?) Is this helpful?

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What do you think about biodynamic viticulture? Does it have some basis in fact, is it all just a new age fantasy, or do you believe something in between?

Biodynamic viticulture is a system of farming whereby the farm is seen as a single organism, and that organism should be taking care of itself in a holistic way including aligning activities with the gravitational pull of the moon. It is of growing importance (and receiving more press) in the wine world with some positive aspects (including connection to the vineyard and marketing) and challenges (including scientific rigor and business risk).

Biodynamics has the benefit of being something solidly achievable by having an established set of principles and protocols to follow, including a third-party certification process. Unlike other wine terms like ‘natural wine’ or ‘sustainable farming’ (without certification), there is understanding of biodynamics, although this system of farming may not be as well-known to the end wine consumer as organic farming.

Which is an opportunity for wineries that do farm biodynamically. Indeed, the farming practices that include fermenting cow manure in a cow’s horn (Prep 501) lends itself well to storytelling to consumers, and is definitely a point of differentiation from a marketing perspective.

The fact that biodynamics is used by some of the most well-known and respected wine estates around the world (including Domaine de la Romanee Conti (Burgundy) and Zind Humbrecht (Alsace)) gives credibility to the biodynamic process. These premium wineries don’t use biodynamics as a marketing point, but will instead, if asked, talk about how biodynamics beings the farmer even more in touch with the vines.

Because biodynamics uses more homeopathic prevention and remedies in the vineyard, efficacy might take longer than more studied organic or conventional targeted strategies, which means that a farmer who practices biodynamic farming needs to spend even more time carefully monitoring the vineyard for pests, diseases and other imbalances.

Spending more time in the vineyard is certainly not harmful, and may be the source of the benefit, but these biodynamic treatments have not been rigorously studied scientifically. Spraying stinging nettle tea in the vineyard might not harm the vines, but was it the tea preparation (and the dynamic stirring that made the tea) that was the benefit, or is it the extreme care the farmer is giving the vines the benefit. Many people point out, quite correctly, the the founder of biodynamics, Rudolph Steiner, was never a farmer, and so this system of farming has always been based on philosophy from other disciplines, not reality.

The fact that the definition of biodynamics implies a closed-system farm yet you can purchase the inputs to biodynamic farming (stinging nettle may not grow in your climate, or it might be tricky to secure a stag’s bladder for fermentation) also raises questions of whether the unique treatments give rise to a healthy vineyard or, again, is it the vigilance of the farmer the driver of quality.

Farming biodynamically is a risky endeavor from a business perspective, especially when converting from other farming systems. Like treating a cough with homeopathic remedies may not be as effective as taking traditional cough syrup, there can be a lag time before the vines develop their own balance and self-resistance against pests and diseases.

In the end, there are many examples of premium wines that practice biodynamics. Due to business risks, and because it seems that spending more time studying the vineyard are the only established facts of biodynamics, this farming system may only be appropriate for boutique wines that can get the return on investment for such careful farming practices. Until there is more scientific explanations, biodynamics might not be something that should be widely adopted for all wines at all price points, but it certainly does no material harm in the vineyard, may strengthen the connection between the farmer and the vines and is a unique point of differentiation from a marketing perspective.

The Plan Part Deux: Wine exam addictions

Certified Wine Educator

I passed the Certified Specialist in Wine exam by the Society of Wine Educators about ten years ago, but I didn’t pursue the higher designation of Certified Wine Educator. I was already making some pretty good money teaching wine classes around town, so I didn’t see the need. In any case, I had some issues with the structure of the exam, plus I was working toward a WSET diploma, which is no small feat.

Books – CHECK! Notebook – CHECK! Plan – CHECK!

Now that I’m working in my dream job, I can justify taking a crack at the CWE exam. I’m nervous because this test seems to focus more on rote memorization, whereas the MW is more about a global understanding of the business of wine. Of course, memorization may be a good thing: I struggle to name more than three subregions of South Africa. Or are they called wards? Or districts? I know, embarrassing, isn’t it?

Preparing for the Exam

Right now, I’m aiming for an exam date in ~~August~~ late May (I know!! But I have some vacation time coming up! Lemme try!!). I’m preparing for the CWE exams by working through the CSW Study Guide and Workbook (which have vastly improved since the late-2000s version), and I’m supplementing my studies with the Oxford Companion to Wine, Exploring Wine from the CIA, and GuildSomm.

I also need to get back into maps, and because the CWE exams include a teaching component, I’m going to commit to teaching you in some of the areas I’m weakest at. What are my weak points, you ask? Oh, pretty much all of the New World!
At the same time, I just completed the Italian Wine Professional Level 2 program—and passed, yippee! I’m also picking up the Italian Wine Scholar course (see comments above). I’m still meeting weekly with my MW tasting group, but my MW-specific studies are taking a backseat to my CWE studies, which will help me reground myself in the core of wine knowledge.

So that’s my new plan! Honestly, I can’t tell if I’m procrastinating or if this modified plan will actually help me, but it’s worth a shot! Wish me luck!

What are you studying for right now?