51. Wine Corks

June 25, 2026

AI Summary

5 min read

The Sound of an Axe in Portugal

In the dry, hilly Alentejo region of southern Portugal, between May and August, you can hear a sound that has been echoing for two thousand years: an axe hitting a cork tree during the harvest. As Carlos de Jesus, director of communications at Amorim Cork—the world's largest cork producer—describes it, the tree turns orange, the air fills with a sweet honeysuckle smell, and "there's a thump and the birds are singing. I can tell you it's truly magical." That cork gets turned into shoes, flooring, and insulation, but about a third of it ends up as the little cylinders stuffed into wine bottles. Every year, Amorim sells about six billion corks around the world, generating more than $800 million in revenue.

The Forty-Three Year Wait

Cork has been harvested in the Western Mediterranean for thousands of years, but it found its true calling in the seventeenth century, when French winemakers—particularly in Champagne—needed a solution for keeping their wine from spoiling. The connection between wine, glass, and cork became inseparable. Portugal now produces half of the world's cork, a dominance that dates back to laws protecting cork forests in the 1200s. The cork oak tree, Quercus suber, can live for centuries and produce a hundred pounds of cork per harvest.

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What you'll learn

1 (01:03) **The Cork Harvest Sound** - Carlos de Jesus describes the sound of an axe hitting a cork tree in Portugal, a sound unchanged for 2,000 years.
2 (02:37) **Cork's Historic Market Dominance** - Cork once held 96-97% of the wine closure market, but that dominance has eroded.
3 (03:02) **Cork's Ancient Origins and Calling** - Cork has been harvested for millennia, but its perfect match with wine began in 17th-century Champagne.
4 (04:06) **Portugal's Unrivaled Position** - Portugal produces half the world's cork, an identity tied to both climate and centuries-old forest protection laws dating to the 1200s.
5 (05:05) **The 43-Year Barrier to Entry** - Cork production has a natural, slow barrier: a tree cannot be harvested for 25 years, and it takes three harvests (43 years total) to produce quality cork for stoppers.
6 (06:04) **From Tree to Stopper** - After harvest, cork seasons for 6-9 months, is boiled, then sorted by humans and machines. Only 30% of planks are good enough for wine stoppers.
7 (07:36) **Consumer Preference for Cork** - A 2019 Journal of Wine Economics study found U.S. consumers pay 8% more for cork-closed wine, despite cork costing up to $2 vs. 25 cents for a screw cap.

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Show Notes

Why do we use a specific kind of tree-bark tissue to seal up 70 percent of wine bottles? Zachary Crockett takes a sniff and gives the waiter a nod. This episode was originally published on June 9th, 2024.

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