A guest in the sky lounge swirls a glass of white Burgundy and asks you, quite sincerely, why it tastes nothing like the Chablis she drank last week — same grape, she says, so what changed? You have thirty seconds and no wine list to hide behind. Everything you need to answer that question starts in the vineyard, long before anyone opened a bottle.
The Vine and Its Fruit
Almost all wine of quality comes from a single species, Vitis vinifera, of which there are thousands of varieties. The variety sets the ground rules: skin colour and thickness, natural acidity, sugar potential, aroma compounds and how early or late the fruit ripens. A grape has four parts, and each contributes something distinct.
| Part of the grape | What it gives the wine |
|---|---|
| Pulp | Water, sugar (becomes alcohol), acids — the bulk of the juice |
| Skins | Colour, tannin, most aroma and flavour compounds |
| Pips (seeds) | Bitter oils and harsh tannin — best not crushed |
| Stems | Tannin and green, stalky character if included |
Pulp in nearly all varieties is colourless. This is why a black grape can make a white wine, and it is the reason Champagne can be made from Pinot Noir.
The Growing Cycle
The vine follows an annual rhythm, and the winemaker's year is built around it.
- Winter dormancy — the vine rests; pruning sets the crop for next year.
- Budburst (spring) — shoots emerge; vulnerable to frost.
- Flowering and fruit set — cold or wet weather here cuts yield.
- Veraison — grapes change colour, soften and begin to accumulate sugar.
- Ripening — sugar and flavour rise; acidity falls.
- Harvest — the crucial judgement call.
What Ripening Actually Does
As grapes ripen, three things move together. Sugar accumulates, which means more potential alcohol. Acidity — chiefly tartaric and malic acid — drops. And flavours evolve along a predictable path.
| Ripeness | White fruit character | Black fruit character |
|---|---|---|
| Under-ripe | Green apple, grass, nettle | Leaf, herbaceous, bell pepper |
| Ripe | Citrus, stone fruit | Fresh red cherry, plum |
| Very ripe | Tropical, mango, pineapple | Blackberry, cassis, jam, prune |
Pick early and you get a lighter, crisper, lower-alcohol wine. Pick late and you get a riper, fuller, higher-alcohol wine. That single decision explains a great deal of what ends up in the guest's glass.
Vintage Variation
Weather changes from year to year — weather is what happened this season; climate is the long-run average. In marginal regions a cool, wet summer and a hot, dry one produce genuinely different wines, which is why vintage matters far more in Burgundy or Bordeaux than in consistently sunny parts of Chile or Australia.
Onboard Notes
- Never claim a vintage is "good" or "bad" from memory. If a guest asks and you are not certain, say the house has tasted it and it is drinking well — or check the tasting note before service.
- Chief Stew and Captain aside, the guest is the only critic that matters. Vineyard detail is a tool for answering questions, never a lecture to deliver unasked.
- This course covers the ground assessed in GUEST Unit 12 (IAMI); the GUEST Program accepts WSET Level 1 as an equivalent level of study.
- xplor is not an accredited GUEST provider and not a WSET Approved Programme Provider: nothing here awards a unit, certificate or qualification, or counts toward one.