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Dawnine Dyer
September 29, 2011 | Dawnine Dyer

Sugar, Acid and pH: Why we care

Just look at these tiny clusters! 2011 isn’t going to go down as a prolific vintage on Diamond Mountain! The good news is that small clusters and berries ripen more readily on a cool year like this one. We’ve had a good week of warm weather which is helping to move things along.

You’ve probably noticed that the term “balance” is something that comes up over and over when you’re talking about wine. Food, too, for that matter. 

When wine is well balanced, you’re naturally attracted to it without necessarily knowing why – it just tastes good! So, in follow up to the last post on berry sampling let’s talk about the major components and why they’re important.

Sugar: The sugar provides the alcohol. We can figure that a little over half of the sugar we measure at harvest will wind up as alcohol in the finished wine. “Degrees brix” translates to percentage of sugar and we measure it with a prism-like instrument called a refractometer. It measures the soluable solids in the juice. About 90% of the soluable solids is sugar and the scale is calibrated accordingly.

Once we have our grape sample juiced and ready, we put a drop of the juice on the lense of the refractometer and presto -  we’ve got the brix instantly. Most wine grapes are harvested between 20 and 26 degrees brix. If we harvest this Cabernet at 24% sugar we can expect to end up around 13% alcohol.

When you buy grapes at the grocery store they’re usually between 15 and 20%, so we’re working with extremely sweet, delicious fruit!

Alcohol gives wine a lot of its body, so we want a high enough sugar to make a full-bodied style satisfying and, for a delicate style, a low enough sugar to keep it light and crisp. On a cool year like this one the sugar is slow to come but, as I said, things are looking good and this Cabernet is 22% sugar – right on track.

Acid: Acid doesn’t sound attractive, does it? But, it’s so important. A good, solid acidity keeps the color bright, the flavors lively, makes the wine food friendly and helps it to age. Of course, too much is distracting because the wine is too tart. Too little and it’s flat. The main grape acids are tartaric andmalic and most wines fall between .5 and 1% acid (TA for titratable acidity), depending upon the growing region and the style.

pH: This is kind of like measuring the strength of the acidity and has a lot to do with the health and stability of the wine. In a warm climate we watch the pH carefully because if it gets too high it creates a friendly environment for bacteria and the wine browns easily. We shouldn’t have to worry about that this year.

On the pH scale 0 is acid, 7.0 is neutral and 14.0 is alkali. Most wines fall between 3.0 and 4.0. So, wine is higher in acid than almost any food you eat unless you enjoy fresh lemons, straight. Which means it’s automatically food friendly!

There’s rain in the forecast, so we hope the weather man is wrong. A little rain is fine – it gets the dust down. More than a sprinkle isn’t good news, but Cabernet has a thick, tough skin and a loose cluster formation (as you can see!) so it usually holds up pretty well. We'll see!

Dawnine Dyer
September 19, 2011 | Dawnine Dyer

The Cabernet is Looking Good!

But it has a way to go. We’ve been berry-sampling this morning and just got back with our zip-loc bags full of grapes for tasting and analysis. We walk the vine rows and gather grapes from each section, or block, of the vineyard so we can gauge how quickly the grapes are ripening and when to finally harvest.

The main things that influence maturation are heat, light and soil moisture and we need to account for variations in the block. So, we take grapes from both sides of the vine. We eyeball the percentage of shaded clusters and gather accordingly. We like to take grapes from the top, bottom and middle of the cluster and also grapes from either side of the cluster. It’s smart to take berries from different parts of the vine, some from near the vine head and others further away... The sample should be as representative as possible because, ideally, we harvest the section once. 

Then, it's back to the winery to taste, get a good look and see how we're stacking up in terms of sugar, acid and pH.

There are some visual cues that we’ve got awhile to go. As you see, the skin color is nice and deep, almost black - that's great - mature Cabernet grapes should look like tiny blueberries. You notice the green seeds? If we were to harvest now, very harsh, bitter tannins would be extracted from them into the wine. We’d like to see something more like Grapenuts cereal - brown and crunchy. And, as we walked the vineyard the stems of the clusters still look quite green. Those should brown up, too.

I wish you could see the flavors. You'll have to trust me that they're coming along nicely, leaving the early season vege character behind and developing the dark, berry-like flavors we love.

The brix, or percentage of sugar, is at 19.3%. With the nice, warm weather predicted for this week we're probably looking at mid October to harvest, much like last year. 

Next post: Sugar, acid, pH: Why they're important

Time Posted: Sep 19, 2011 at 3:31 PM
Dawnine Dyer
September 12, 2011 | Dawnine Dyer

Final Thinning 2011- the countdown to harvest begins!

It’s often done in the name of flavor intensity. You can see the dried clusters that were dropped some weeks ago mixed in with the fresh ones we thinned just now.

This year the last of our green thinning is in the Petit Verdot. In this case, we’re not only looking for flavor intensity but uniformity of ripening. If we don’t remove the green fruit that’s lagging behind while the rest of the crop matures it may add green, under-ripe flavor and throw off our sugar averages as we get closer to harvest. We also don’t want to see any crowding among the clusters, although there’s little risk of that this year.

We had already thinned to just one cluster per shoot, which is a severe, but effective way to encourage ripening and flavor concentration (it’s more common to see two clusters per shoot). Now, we’ve followed up at veraison (the color change) by removing the “wings” from clusters that were still green when the rest of the cluster was fully colored (sometimes a small, lateral cluster, a “wing”, juts out by the shoulder of the main cluster, kind of like a wing on a bird).

It’s a mark of the vintage to be talking about veraison on September 12th. We had an unusually cool, weepy spring and cold rains in May so we’re about two to three weeks behind in the vineyard. A late vintage is neither good nor bad – it all depends upon what happens, weather wise, over the coming weeks. If it continues to be cool, as it has been most of the summer, the grapes will ripen slowly. A warming trend can move things right along. Petit Verdot is a late ripener, so we’ll be happy to have it in before November.

The May rains did some preliminary crop thinning for us. Rain at flowering time interferes with pollination, and, valley-wide, crop estimates are down. Here on Diamond Mountain we tend to be on the late side so we missed the worst of the rain but, even so, we see a small crop and also small clusters, which bodes well for flavor concentration.

We thought it might be fun to share our progress in the vineyard as we move into the final phases of the 2011 growing season and focus on the upcoming harvest. At this point, we’re roughly 4-5 weeks out, depending on the weather. We’ll keep you updated as the vineyard progresses and the crush begins.

Time Posted: Sep 12, 2011 at 2:12 PM