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In California's Central Valley, there's a field of trees stretching to the horizon in perfectly straight rows.
Explores why chestnuts, which use less water than almonds, are less popular despite their history and nutritional benefits.
Key Takeaways
- Chestnuts require much less water than almonds but are less commercially viable due to perishability and harvesting challenges.
- The American chestnut was once a major food and timber source before being nearly wiped out by blight.
- Chestnuts behave more like fresh produce or grains, needing special processing to be stored and used.
- Almonds dominate the nut market because they are dry, durable, and fit well into industrial food supply chains.
- Reviving chestnuts faces ecological, economic, and logistical hurdles despite their nutritional and environmental advantages.
What the video covers
- California grows 80% of the world's almonds, each requiring about 1.5 gallons of water to grow.
- Chestnuts grow naturally without irrigation and have been a staple food in Europe for centuries.
- American chestnuts were once abundant but were devastated by a fungal blight in the early 1900s.
- Chestnuts differ from almonds nutritionally, being high in water and starch, and low in fat.
- Chestnuts spoil quickly and require drying to preserve, unlike almonds which store well.
- Harvesting chestnuts is labor-intensive and slower compared to mechanized almond harvesting.
- Chestnuts are treated more like grains in traditional use, making them less compatible with modern food systems.
- The almond industry benefits from ease of storage, shipping, and processing, which chestnuts lack.
- Chestnuts remain popular in parts of Europe and Asia but never gained global commercial dominance.
- Efforts to restore American chestnuts include genetic research to combat the blight.
Chapters
- 00:00Introduction to Almond Farming in California
- 00:35Chestnuts: A Water-Efficient Nut
- 01:20Chestnuts in European Cuisine and Culture
- 02:04American Chestnut History and Uses
- 02:43Ecological Impact of the Chestnut Blight
- 04:40Why Chestnuts Disappeared from American Diets
- 05:14Physical and Nutritional Differences Between Chestnuts and Almonds
- 05:50Challenges of Chestnut Harvesting and Storage
- 07:32Chestnuts vs Almonds in Modern Food Systems
- 09:28Efforts to Restore the American Chestnut
Full Transcript — Download SRT & Markdown
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Every single one of them is drinking. Pipes run along the ground, feeding water to each trunk all summer long in a place where it barely rains for months. These are almond trees. California grows around 80% of all the almonds on the
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planet. And according to an estimate by water researcher Peter Gleick at the Pacific Institute, each individual almond took somewhere around 1 and 1/2 gallons of water to grow. One nut, a gallon and 1/2.
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Now picture a different tree on a rocky hillside in Italy or Corsica that nobody waters at all. It drinks whatever falls from the sky, and every autumn it drops a carpet of food on the ground. That tree is a chestnut. People have lived off it
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for centuries. And yet walk into any grocery store and you'll find almonds in every form imaginable. Almond milk, almond flour, almond butter. Chestnuts show up for about 2 weeks around Christmas if they show up at all. So if
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chestnuts can grow on rain alone, why did the thirsty nut win? The obvious guess is taste. Maybe chestnuts just aren't very good. Except people who eat them describe something sweet and soft, closer to a roasted sweet potato than a
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nut. Entire mountain regions of Europe built their cooking around them. In Corsica, the chestnut was called the breadfruit tree because dried chestnuts were ground into flour that could feed a whole family through winter.
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Rulers of the island once ordered families to plant chestnut trees every year to protect against famine. So taste isn't the problem. The second guess is that chestnuts never grew here. Maybe they're just a European thing. That one is even further off. North America used
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to have more chestnut trees than almost anywhere on Earth, billions of them. The American chestnut stretched from Maine down to Georgia, and in parts of the Appalachians, it was the dominant tree on the ridges. In western Maryland, surveys from before the blight found
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chestnut made up about half the timber on the ridge tops. People ate the nuts straight off the ground. They ground them into flour. They fattened hogs on them. The Hodenosaunee pressed oil from them. Rural families in Appalachia gathered them by the wagon load every
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fall and sold them in town for cash. It was free food falling out of the sky, and there was a lot of it. And it wasn't just people eating them. The American chestnut was one of the most reliable
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food sources in the entire eastern forest. Oak trees are moody. They can drop a huge acorn crop one year and almost nothing the next. Chestnuts flowered late in the spring after most of the frosts have passed. So, their
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crop came in year after year without much drama. Bears, deer, turkeys, squirrels, and passenger pigeons all fed on them through the fall. The wood was just as valuable. It grew straight, it split easily, and it resisted rot for
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decades. So, it went into fence posts, barn beams, railroad ties, and telegraph poles all over the country. In the 1800s, vendors sold roasted chestnuts from carts on the streets of New York.
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The same way hot dog carts work today. Freight trains carried bags of them from the mountains into the cities every autumn. If you lived in the eastern United States back then, the chestnut was about as ordinary as an apple. Then,
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something arrived that nobody saw coming. In 1904, a forester named Herman Merkel noticed something wrong with a chestnut tree at the Bronx Zoo in New York. The leaves were wilting. The bark was covered in tiny orange specs. It was
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a fungus that had arrived on imported Asian chestnut trees. And the Asian trees had evolved alongside it for so long that they barely noticed it.
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American chestnuts had never met it. They had no defense at all. The spores traveled on the wind, and the blight spread at roughly 50 miles a year.
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Within about 40 years, it had killed an estimated 3 to 4 billion American chestnut trees. That's one of the largest ecological losses in the history of North America, and it happened inside a single human lifetime. The strangest part is that the trees didn't fully die.
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The fungus kills the trunk, but the roots survive underground. To this day, those old roots keep sending up new shoots in the forests of Appalachia. The shoots grow for a few years, get to around 20 ft tall, and then the blight
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finds them again and kills them back down. Scientists call the species functionally extinct. In plain terms, it still exists, but it can never grow up. And that's the first real reason Americans don't eat chestnuts. An entire generation lost the
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habit. The trees vanished, the fall harvest stopped, and the food quietly dropped out of American kitchens. By the time anyone tried to bring it back, almonds had already taken the spot. But that only explains America. Chestnuts are still grown all over Europe and
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Asia. So, why didn't they take over the world's nut aisle the way almonds did?
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And this is where it gets physical. A chestnut is barely a nut at all. Almonds are dry. They're mostly fat and protein with very little water inside, which means you can roast them, salt them, bag them, and leave them in a warehouse for
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a year. Chestnuts are the opposite. According to Michelle Warmond, a plant scientist at the University of Missouri, a fresh chestnut is about 40 to 50% water. That's why you have to cut an X into the shell before roasting one, or
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it can burst in the oven. All that moisture means chestnuts behave like fresh produce. Leave them on the counter, and they start to dry out and turn hard. Keep them too damp, and they grow mold. In the fridge, they last a
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few weeks. So, you've got a nut that spoils more like a potato. The people who depended on chestnuts for centuries had a solution, and it tells you a lot.
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They dried them. In the mountain villages of Corsica and northern Italy, families built small stone drying huts in the chestnut groves.
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The nuts were spread out on a wooden rack near the ceiling, and a slow fire burned underneath for weeks. The smoke and heat pulled the water out until the chestnuts were hard as pebbles. Then, they were peeled and carried to a mill
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to be ground into a sweet brownish flour. That flour could last through the whole winter. It became bread, porridge, pancakes, and polenta. In other words, the only way to turn chestnuts into a food that keeps was to stop treating
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them like a nut and start treating them like grain. That takes labor, firewood, and time. And it produces a flour that has no gluten, which means it won't rise like wheat bread. It works beautifully in a village kitchen. It doesn't scale
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easily in a modern bakery. For a modern food company, that moisture problem wrecks the entire supply chain. Almonds can be shipped across oceans, stored for months, and sold whenever prices are good. Chestnuts have to be cooled almost immediately after harvest, kept cold the
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whole way to the store, and sold within a short window. Then, there's the harvest itself. Almond growers use a machine that grabs the trunk and shakes the whole tree. Every almond falls in a few seconds, gets swept into rows, and
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is scooped up off the orchard floor. An entire field can be cleared in days.
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Chestnuts don't cooperate. They ripen gradually, falling from the tree over several weeks, wrapped in a spiky burr that looks like a sea urchin and feels like one, too.
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Growers have to go back over the same ground again and again. Weevils love them. And the nuts can't just sit on damp ground waiting because they start to spoil.
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So, one crop was built for a factory, and the other was built for a family with a basket. Now for the twist.
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Putting chestnuts next to almonds was the mistake in the first place. Nutritionally, chestnuts are almost nothing like other nuts. They're very low in fat and mostly starch. They even contain vitamin C, which almost no other nut does. A chestnut is closer to a
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grain or a potato that happens to grow on a tree. That's exactly why the mountain
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the wrong product. Too soft, too perishable, too strange. And in a way, they are. They're a staple food sitting in a snack category. Meanwhile, in China, which eats the overwhelming majority of the world's chestnuts, they're as ordinary as popcorn. They're
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roasted on street corners in giant woks full of hot sand, sold by the bagful, and eaten like a regular winter food.
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So, when you follow it all the way through, there are three reasons the water-hungry almond won. The American chestnut was wiped out before modern food companies ever got their hands on it. The chestnut itself is too wet to
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store and ship like a normal nut. And its harvest can't be squeezed into a single shake of a machine. Almonds are dry, durable, and mechanical. Chestnuts are soft, slow, and seasonal. Our food system rewards one of those and quietly
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ignores the other. And the almond's convenience comes with costs that are easy to miss. Beyond the water, almond orchards are so large that beekeepers truck enormous numbers of hives into California every February just to pollinate them. Chestnuts mostly
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rely on the wind. They don't need sprinklers on hillsides that have fed people for centuries. If you designed a nut tree for a hot, dry future, it would look a lot more like the chestnut than the almond. None of this means almonds
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are the villain. They became popular for good reasons. They're cheap to store, easy to ship, and they fit into almost anything a food company wants to make.
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Almond milk took off right as people started looking for alternatives to dairy, and almonds were sitting in warehouses ready to go.
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Chestnuts could never have filled that role. You can't press a wet, starchy nut into a creamy milk the same way, and you can't keep a year of inventory sitting around without freezing it. So, the market picked the nut that behaved like
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a product. And once an industry gets that big, it builds everything around itself. Shakers, processing plants, research programs, marketing boards, shelf space. A chestnut grower in Missouri is competing against all of that with a crop that falls on the
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ground in spiky balls and needs to go in the fridge. It was never a fair fight.
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People are trying to bring it back. Since 1983, the American Chestnut Foundation has been crossing the American tree with blight-resistant Chinese chestnuts, trying to keep the American genes while borrowing the resistance. Researchers at SUNY in Syracuse took another route,
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adding a single wheat gene that helps the tree neutralize the acid the fungus uses to kill it. That project hit setbacks, including a lab mix-up where the wrong tree line was used in some field trials. Meanwhile, farmers in
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Missouri and Michigan have quietly started planting Chinese chestnut orchards, and they can't always grow enough to meet demand. So, the next time you see a street vendor in winter with a smoking cart of roasted chestnuts, you're looking at what's left of a food
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that once fell by the billions across an entire continent. Somewhere in the Appalachian woods, an old root is pushing up another green shoot right now, still trying to grow tall enough to drop its nuts on the ground again.
Topics:chestnutsalmondswater usageAmerican chestnut blightnut harvestingfood supply chainsustainable agriculturenut nutritionCalifornia agriculturefood history
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