Why does California Chardonnay taste like that?

Characteristically very low tannin, medium-plus acidity and medium-full body. Commonly associated with green apple, lemon, white peach, pineapple.

Not claiming: That every wine from this variety shows these characteristics. This is the range across the category, and site and winemaking move wines within and beyond it.

Warmer growing seasons are associated with faster sugar accumulation and lower retained acidity, so fruit reaches a given potential alcohol earlier in the season.

Varies: Above the vine’s photosynthetic optimum the relationship reverses: extreme heat stalls ripening, inhibits anthocyanin synthesis and can raise sugar only through berry dehydration.

Not claiming: That warm regions necessarily make high-alcohol wine. Potential alcohol at any moment is a choice point; the producer decides when to pick.

Proximity to a large body of water moderates temperature extremes, which is associated with a longer, more even ripening period and a lower risk of both spring frost and extreme summer heat.

Varies: Maritime influence also raises humidity, which raises fungal disease pressure. It is not uniformly an advantage.

Not claiming: That a maritime climate is cool. Maritime describes variability, not temperature.

A Mediterranean pattern of wet winters and dry summers is associated with reliable ripening and with mild late-season water stress, which restricts berry size and raises the ratio of skin to juice.

Varies: Where the dry season is severe or lengthening, the same pattern produces damaging rather than beneficial stress, and irrigation becomes necessary rather than optional.

Not claiming: That water stress is beneficial as such. Mild stress helps; severe stress halts ripening.

Lactic acid bacteria convert sharp malic acid into softer lactic acid, lowering total acidity and raising pH.

Not claiming: That malolactic fermentation is a second alcoholic fermentation. No alcohol is produced; it is a bacterial conversion.

Lactic acid bacteria can produce diacetyl during malolactic fermentation, as an intermediate in citric acid metabolism.

Varies: How much survives depends on bacterial strain, temperature, oxygen and how long the wine subsequently rests on its lees — yeast reduce diacetyl to compounds with far higher sensory thresholds.

Not claiming: That every malolactic fermentation produces perceptible buttery character. Many produce none.

Fermenting white wine in oak rather than steel, which integrates the oak more completely.

Not claiming: That every producer of this style uses this method, or that using it is required.

Chardonnay is aromatically fairly neutral, and producers commonly use malolactic fermentation, lees ageing and barrel work to build texture and complexity. Whether any of them is used is a decision, not a property of the grape.

Varies: Chablis producers commonly restrict or block malolactic fermentation; a great deal of the world’s Chardonnay sees no oak at all.

Not claiming: That Chardonnay requires oak or malolactic fermentation, or that all Chardonnay undergoes either.

Autolysis of spent yeast releases mannoproteins and other compounds that contribute texture and weight, and savoury bready characters.

Varies: Effect scales with time and is increased by stirring the lees.

Not claiming: That a bready or brioche character proves long lees ageing. Other routes to similar descriptors exist.

Three to eight years. The leaner, less oaked wines now made on the cooler coastal sites age considerably better than the full-malolactic style the region became known for.

Not claiming: That a wine of this style will develop these characters. Ageing potential varies by producer, vintage and storage, and most wine is better young.