🍷 Horizontal bottle storage

Horizontal bottle storage (storing wine on its side, or laying wine down) means a bottle rests sideways instead of standing upright. The habit comes from the cork: lying down, the wine touches the stopper, and the usual belief is that this keeps it from drying out. Australian researchers have put that belief to the test.

The Australian Wine Research Institute (AWRI) sums up two studies. In the first, white and red wine were sealed with six types of closure. After 24 months the upright bottles had a little more yellow-brown colour than the ones lying down, though the gap was not significant. Oxidation was clearly higher only under agglomerated cork, the kind pressed from granules. The second study ran for 60 months with a wooded Chardonnay and a Riesling, and the bottle's position barely changed either the chemistry or the taste.

So the room matters more than the pose. AWRI points to a cool, dry spot at 15–20 °C, with the cork in contact with the wine. A long spell above 25 °C, or even a short one at 40 °C, can hurt quality. Big swings between day and night are worth avoiding, because wine expands and a cork can creep or leak. Air that is too dry is hard on natural cork, too.

If you plan to keep a bottle for months under natural cork, lay it down in a wine cellar and you cover the question for free. If you will open it this week, standing it upright loses nothing. Beside this habit sit storage temperature, storage humidity and darkness: the page on glass explains the light side, and the one on the wine refrigerator shows one way to get steady cold at home. Together they make up wine storage and trade.

A bottle on its side also needs the right climate. Cellar guides give 60-70% relative humidity as the working range, and 75% is often quoted, although little research confirms an optimum. For long keeping the usual target is about 13 °C, with 7-18 °C tolerated, and daily swings of more than a few degrees count as harmful. Sparkling wine bends the rule: after disgorgement the pressure inside a Champagne bottle keeps the cork moist, so lying flat matters less.