Without ethylene, bananas simply rot
Thousands of miles from Tokyo's grocery aisles, a geopolitical chokehold on the Strait of Hormuz is quietly threatening one of Japan's most beloved staples. The banana — humble, affordable, and deeply woven into the fabric of Japanese household life — depends not just on distant farms, but on ethylene gas derived from petroleum to complete its journey from green to golden. With naphtha inventories falling sharply and reserves measured in months rather than years, Japan confronts a reminder that the most ordinary comforts rest on the most intricate of global arrangements.
- The Strait of Hormuz closure has cut off roughly a fifth of global oil shipments, and Japan — importing over 90% of its crude — is feeling the strain in places as unexpected as its banana ripening rooms.
- Naphtha inventories are down 25% this year, pushing the ethylene shortage to its worst level in five decades and leaving importers with only two to three months of buffer before the crisis becomes visible on store shelves.
- Without ethylene gas, green bananas cannot ripen and will simply rot — making this petrochemical not a luxury input but an invisible lifeline for 1 million tonnes of fruit consumed annually.
- Retail banana prices in Tokyo have already climbed 4.4% year-over-year and more than 30% since 2022, with industry leaders warning that further increases are likely even as they vow to prevent outright shortages.
- The banana industry is mobilizing to hold the line, but the clock is running — and whether shelves stay stocked depends entirely on whether geopolitical tensions ease before the reserves run dry.
Japan's banana supply looks stable for now, but the chain keeping it that way is under serious strain. The source of the trouble lies far from any grocery store: the closure of the Strait of Hormuz has cut off roughly a fifth of the world's oil shipments, and Japan — which imports more than 90 percent of its crude — is absorbing the shock in an unexpected corner of its food system.
The connection between oil and bananas runs through ethylene gas, a byproduct of naphtha processing that is used to ripen green bananas in controlled chambers before they reach retail shelves. Without it, the fruit does not soften or sweeten — it simply rots. Japan imports around 1 million tonnes of bananas each year, making them one of the country's most essential grocery staples, with the average household spending roughly 5,200 yen on them in 2025 alone.
Eiji Akashi of the Japan Banana Importers Association has called this the worst ethylene shortage in five decades. Naphtha inventories have fallen by a quarter so far this year, and while some importers have secured enough ethylene to sustain operations for two to three months, the margin is thin. Bananas are especially exposed — they require far more ethylene than other ethylene-ripened fruits like avocados or kiwis, a vulnerability confirmed by Farmind, which handles about 30 percent of Japan's banana processing.
The price signals are already arriving. Tokyo retail banana prices have risen 4.4 percent over the past year and more than 30 percent since 2022. Akashi acknowledged further increases are likely, but insisted the industry is doing everything possible to prevent actual shortages. What happens next hinges on a question no banana importer can answer: how long the Strait of Hormuz remains closed, and whether Japan's reserves can outlast the disruption.
Japan's grocery stores are stocked with bananas today, but the supply chain that keeps them there is fraying. The problem begins thousands of miles away, in the Strait of Hormuz, where a closure has choked off roughly a fifth of the world's oil shipments. For Japan, which imports more than 90 percent of its crude oil, the consequences are rippling through an unexpected corner of the food system: the ripening rooms where green bananas are transformed into the yellow fruit that appears on dinner tables across the country.
The mechanism is simple but critical. Japan imports bananas while they are still green, then uses ethylene gas—a byproduct of naphtha processing—to ripen them in controlled chambers before they reach retail shelves. Without ethylene, bananas will not soften or develop sweetness. They simply rot. Last year, Japan purchased roughly 1 million tonnes of bananas, making the fruit one of the nation's most essential grocery staples. The average household spent about 5,200 yen, or roughly $33, on bananas in 2025 alone.
The shortage is now the worst in five decades, according to Eiji Akashi, secretary general of the Japan Banana Importers Association. Naphtha inventories have fallen by a quarter so far this year as the Strait of Hormuz closure persists. The industry is not yet facing empty shelves—some importers have secured enough ethylene to sustain operations for two to three months—but the margin is thin. The pressure is mounting on retailers to absorb and eventually pass along the rising costs of fuel, packaging, and shipping that accompany any petrochemical shortage.
The price signals are already visible. Tokyo retail prices for bananas climbed 4.4 percent in the past year alone and have risen more than 30 percent since 2022, according to government data. Akashi acknowledged that further increases are likely, though he emphasized that the industry is mobilizing to prevent actual shortages. "Prices may rise, but we're doing everything we can to avoid shortages," he said. "The entire banana industry is committed to doing everything it can to maintain stable supplies."
Bananas are not the only fruit dependent on ethylene ripening—avocados and kiwis also rely on the gas—but bananas require far more of it. Farmind, a company that handles about 30 percent of Japan's imported banana processing, confirmed that the fruit's ripening demands are substantially higher than those of competing produce. This concentration of need makes bananas uniquely vulnerable to any disruption in ethylene supply.
For now, the industry is holding. But the closure of the Strait of Hormuz shows no signs of ending, and the reserves that have cushioned importers against immediate crisis will eventually deplete. What happens next depends on whether global oil flows resume or whether Japan must learn to live with permanently tighter supplies of the gas that keeps its bananas from rotting on the shelf.
Notable Quotes
Prices may rise, but we're doing everything we can to avoid shortages. The entire banana industry is committed to doing everything it can to maintain stable supplies.— Eiji Akashi, secretary general of the Japan Banana Importers Association
The Hearth Conversation Another angle on the story
Why does Japan need ethylene specifically? Can't bananas ripen on their own?
They can, but not in the way the market demands. Green bananas shipped from tropical regions will eventually ripen, but the timing is unpredictable and the quality suffers. Ethylene lets importers control exactly when and how the fruit ripens, so it arrives at stores at peak quality. Without it, you get either unripe fruit or fruit that's already begun to decay.
So this is really a problem about timing and logistics, not about the fruit itself.
Exactly. Japan has built an entire system around importing green bananas and ripening them domestically. That system depends on a cheap, abundant supply of ethylene. The Strait of Hormuz closure broke that assumption.
The article mentions 2-3 months of reserves. What happens when those run out?
That's the real question. If the strait stays closed, importers will face a choice: ration ethylene and let some bananas rot, raise prices sharply to reduce demand, or find alternative ripening methods. None of those options are painless.
Could Japan switch to importing ripe bananas instead?
Theoretically, yes, but ripe bananas are far more fragile in transit. They bruise easily, spoil faster, and cost more to ship. The entire import model is built on the durability of green fruit. Switching would require rethinking logistics, storage, and distribution from the ground up.
Is this just a banana problem, or a sign of something larger?
It's a window into how dependent Japan is on stable global oil supplies. Bananas are visible because they're on every table. But the same pressure is hitting petrochemicals across the economy. The banana shortage is just the most tangible symptom.