Wine myths
Terroir is just marketing
“Terroir is a French invention to justify charging more for the same wine.”
Site demonstrably changes wine — through climate, water, exposure and season length. What is not established is the romantic version, where a place transmits its own flavour into the glass.
The full answer
The measurable part is not in doubt. Two vineyards a few hundred metres apart can differ in mean temperature, water availability, frost exposure and ripening date by margins that change the wine substantially and repeatably.
Vintage after vintage, the same parcels behave the same way relative to their neighbours. That reproducibility is what an appellation system is attempting to encode, however imperfectly.
The unsupported part is the mystical version — that a site imparts a signature flavour by some route independent of climate, water, variety and human decision. That claim has no demonstrated mechanism, and it is the one used to sell things.
Both extremes are wrong. "Terroir is magic" and "terroir is meaningless" are equally unhelpful, and the useful position is in the middle: site effects are real, largely explicable, and often smaller than the human decisions taken afterwards.
The concept has certainly been used commercially, and appellation boundaries are political documents as well as agronomic ones.
A reading of the available evidence by people qualified to make it, where the evidence genuinely underdetermines the answer.
What would settle it: Evidence arriving that settles the question either way.
Sources
Sources consulted
- Institut national de l’origine et de la qualité (INAO) — INAO, France
- UC Davis Department of Viticulture and Enology — University of California, Davis
- The Oxford Companion to Wine — Oxford University Press