by Jeff Miller of Artisan Family of Wines (Seven Artisans, Sly Dog Cellars, Red Côte)
It has been a while since I’ve written about this subject, but it’s worth writing about it again. What brought me back to the subject was an article on Palate Press by Blake Gray on the subject. It can be found at,
While I pretty much agree with the conclusion Gray reaches, which is that the idea that lower yields translate into higher quality is a myth, I do have some pretty serious reservations about the method he uses. As I understand it, he basically takes some pretty broad brush statistics available to determine yield for the grapes which went into certain wines and then compares them to the prices of those wines on the secondary market. If the lower yield equates to higher quality thesis holds true, then, he reasons, you should see the prices higher for the lower yield wines. In fact, you see the opposite, although to a relatively slight degree.
I guess I can go along with Gray to the limited extent of saying that if lower yields had a clear and dramatic correlation with higher quality, then you would probably expect to see a dramatic increase in prices where yields were lower. Since you don’t, the thesis does not hold.
Of course, you don’t need a PhD in statistics to see that the methodology is broadbrush, to say the least.
But I do think you can get to pretty much the same place in a far more direct way.
When you are growing a grapevine, what you are looking for is balance between vegetative growth (shoots and leaves) and grapes. While there are various tests that people apply to determine when you achieve that balance, personally, I don’t think which one you choose is all that important, because the grapevine will produce high-quality fruit in a reasonably broad range of “balance”.
One test which is very easy to apply because of its simplicity is to aim for shoots that are in the neighborhood of 4 feet long. Why do you look at the shoots and not the grapes? Because the amount of fruit that you allow to hang largely determines how much vegetative growth you going to end up getting. And while you have some degree of control over vegetative growth by the amount of fruit you allowed to hang, there is no converse control that you have over the amount of fruit you produce by controlling for the amount of vegetative growth. So if you hang an amount of fruit that gives you four foot shoots, you’re not going to be very far off from optimal.
If you hang less fruit than that, you’re going to get more vegetative growth, which is going to lead to not just less fruit, but more shaded fruit, and often fruit that, contrary to what the proponents of low yield content, that gets less, not more, of the resources of the plant. Why? Because those resources are instead going to vegetative growth instead of fruit ripening.
It’s a nice idea that you can hang less fruit and expect that the vine will accommodatingly produce the same amount of food in the form of carbohydrates and direct it all towards the lesser amount of fruit, with the result that that fruit gets a megadose of nutrients, and therefore produces the Superman equivalent of fruit. But it just doesn’t happen that way.
One thing that Gray’s analysis does not take into account is that higher yields translating into better quality only works up to the point of optimal fruit quality. As you hang more and more fruit, the vine does not produce enough leafage to ripen the over abundance of fruit, and you get lower quality fruit. So it’s not a simple higher or lower yield, but the right yield.