Yes — wine with natural cork closures should be stored on its side to keep the cork moist and maintain the seal. Dry corks shrink, let air in, and cause oxidation. Wines with screw caps, synthetic corks, or glass stoppers can be stored in any orientation without risk.
The Cork Connection
The reason is simple: natural cork is porous. When a bottle stands upright for months, the cork dries out from the inside. A dry cork shrinks, cracks, and loses its seal. Once air gets past the cork, oxidation begins — and there is no going back.
Storing bottles horizontally keeps wine in contact with the cork, which keeps the cork swollen and tight in the neck. This is why every serious cellar uses horizontal racking.
When It Does Not Matter
- Screw cap wines — no cork to dry out. Store any way you like.
- Synthetic cork wines — plastic does not shrink. Orientation is irrelevant.
- Glass stopper wines (Vinolok) — inert, airtight seal regardless of position.
- Wines you will drink within a week — the cork will not dry out that fast.
What About Sparkling Wine?
Champagne and sparkling wine is the one exception to the horizontal rule. The internal pressure (6 atmospheres in Champagne) keeps the cork hydrated from inside, so upright storage is fine. Some producers actually prefer it — less cork surface in contact with the wine means less cork taint risk.
But most cellar racking stores Champagne horizontally anyway because it fits the same racks as everything else, and it does no harm.
Bijou builds racking designed for proper horizontal storage with options for every bottle format.
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