Wine myths
Dry-farmed vines make better wine than irrigated ones
“Irrigation dilutes wine. Proper vineyards are dry-farmed.”
Over-irrigation does dilute. Careful deficit irrigation is a precision tool that can improve fruit, and in many regions dry farming is simply impossible.
The full answer
Excessive water at the wrong time genuinely does produce large, dilute berries and excessive canopy vigour. That is the observation the belief rests on and it is correct.
Regulated deficit irrigation inverts the argument. Applying a controlled shortage after fruit set restricts berry size and shifts the vine from shoot growth to ripening, and it does so far more precisely than waiting for rain.
Geography decides much of this. Parts of Europe evolved under enough summer rainfall that dry farming works and irrigation was long prohibited; much of Australia, Argentina and California would have no viticulture at all without it.
Water availability is also now a constraint rather than a preference. Where aquifers and rivers are under pressure, the question is shifting from what makes the best wine to what is possible at all.
Mild water stress at the right moment is genuinely valuable, and vines with unlimited water make poor wine.
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
- UC Davis Department of Viticulture and Enology — University of California, Davis
- Wine Australia — regions, GIs and market information — Wine Australia
- Research on climate change and viticultural suitability — Peer-reviewed climate and viticulture literature