For me the answer is… root days!
And isn’t that what you might expect if you subscribe to a rather literal interpretation of the importance of terroir? Or could it just be that the whole idea is a load of bollocks? I am of course talking about the biodynamic theory that lunar cycles affect the taste of wine, fruit days being the most auspicious.
Here’s what I did to test the hypothesis. I analysed all 568 of my tasting note scores from last year. The scores range from 1 to 6, corresponding to the number of stars in my rating system. At the time of tasting I was unaware of the type of day. I used this 2009 biodynamic calendar for the analysis. I presume it is reasonably accurate. I did check a few days against another calendar, and they were in agreement. I have no idea at what time the type of day changes on any particular date, but as I could not find this information and very few people seem to care, I decided to ignore the issue. Most wines would have been tasted at some time in the evening. If you want to reanalyse my raw data feel free. In the meantime, here is my summary of scores awarded on each type of day .
|Mean||Std Dev||Number tasted|
So, if anything, I think wines taste best on root days, and worst on fruit days. But actually there are barely any significant differences at all. A one-way ANOVA test gives a p-value of 0.091 level. Or to put it another way, one would expect to get such a large spread in the means about one time in ten purely from random variation.
As far as I am concerned I got pretty much the results I expected, and I don’t feel any need to research this issue further. To be frank I think I have already given this nonsense a lot more time than it deserves. However, if you have any more evidence to bring to light I’d be interested in seeing it. But please – no more anecdotes about tasting wines when you were aware what sort of day it was. And no half-baked argument along the lines of “if Tesco believe in it, there must be something in it”. Hard data only.
Or perhaps you could explain from a theoretical point of view why this agricultural calendar has any relevance at all for wine tasting. Why should fruit days be any better than, say, Fridays – which is when I think wine tastes best.