Avocado

• 1. Introduction

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  The avocado is an evergreen tree of the laurel family, and its fruit is botanically a large berry built around a single oversized seed. Some researchers believe that seed was once meant for a stomach that no longer exists. The animals thought to have swallowed avocados whole and carried their seeds across the landscape are gone. Among the candidates is the gomphothere Cuvieronius, an elephant relative, alongside ground sloths, toxodontids, and glyptodonts. How does a fruit outlive the creatures it depended on? How did a wild plant with a tiny seed become a buttery staple grown across the tropics and Mediterranean climates of the world? And why does a single piece of green flesh carry so much weight, in water, in money, and in the affairs of organized crime? The answers run from preceramic camps in Peru to a mail carrier's backyard in California.

• 2. Ghosts Of A Lost Diet

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  Connie Barlow, in her 2001 book The Ghosts of Evolution, gathered the case that the avocado is an evolutionary anachronism, a plant adapted to a world that vanished. The idea of megafaunal dispersal syndrome was first proposed in the 1980s by Paul S. Martin and Daniel H. Janzen. The reasoning is simple and strange. A large fruit with a large seed makes sense only if some large animal eats it and deposits the seed far away. With the giant beasts extinct, the avocado should have no way to travel. Early wild avocados, the ones from before domestication, carried seeds far smaller than today's, likely wrapped in smaller fruit. Not everyone accepts the lost-disperser story. Critics point out that plenty of large fruit still get moved by ordinary animals. Agoutis and spectacled bears, both very much alive, have been observed eating domestic avocados. The argument leaves a tidy mystery: if not extinct giants, then who first carried the seed far enough to matter? The next chapter answers it, and the disperser turns out to be us.

• 3. Ten Thousand Years Of Hunger

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  At Huaca Prieta, a preceramic site on the northern coast of Peru, humans were eating avocados as early as 10,500 years ago. That is the oldest known avocado remains, older than the avocado pits found in Coxcatlan Cave, which date from around 9,000 to 10,000 years ago and were once thought to be the earliest. The earliest residents of northern coastal Peru lived in temporary camps in an ancient wetland. Avocados sat on their menu beside chilies, mollusks, sharks, birds, and sea lions. At Norte Chico sites such as Caballo Muerto, avocado use turns up again from around 3,800 to 4,500 years ago. Domestication is traditionally traced to the Tehuacan Valley in the state of Puebla, Mexico, but the human relationship clearly runs older and wider. Genetic and linguistic work identifies three major domesticated landraces. The Guatemalan, called quilaoacatl, and the Mexican, called aoacatl, came from the highlands. The West Indian, called tlacacolaocatl, is a lowland variety reaching from Guatemala and Costa Rica through Colombia and Ecuador to Peru. These three landraces had likely already mingled in pre-Columbian America, and they are described in the Florentine Codex. A water jar shaped like an avocado, dating to AD 900, was found in the pre-Inca city of Chan Chan.

• 4. The Word For Testicle

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  The word avocado comes from the Spanish aguacate, which traces back to the Nahuatl word āhuacatl, and further back to the proto-Aztecan pa:wa. In Molina's Nahuatl dictionary, auacatl is also given as the translation for compañón, meaning testicle. That coincidence fed a popular claim that testicle was the word's original meaning. The truth runs the other way. The original sense reconstructs as avocado, and the word seems to have served in Nahuatl as a euphemism for testicle, not the reverse. The English name arrived through a rendering of aguacate as avogato. The earliest known English use is attested from 1697 as avogato pear, later avocado pear because of its shape, a term sometimes corrupted to alligator pear. Spanish-speaking countries split. Central America, the Caribbean, and Spain keep the Mexican name aguacate, while Argentina, Chile, Peru, and Uruguay use the Quechua-derived palta. Compounding leaves its own trail. The Nahuatl ahuacamolli, meaning avocado soup or sauce, gives Spanish its guacamole. Local names multiply from there. Trinidad and Tobago calls it Zaboca, from the French Creole l'avocat. Parts of India and Hong Kong call it butter fruit. Australian English coined the clipped avo, now common in South Africa and the United Kingdom. The first written English account of the word came from Hans Sloane, who coined the term in a 1696 index of Jamaican plants.

• 5. A Mail Carrier's Tree

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  Rudolph Hass, a mail carrier of La Habra Heights, California, raised a single seedling that became the world's dominant avocado. He patented the productive tree in 1935. Every Hass tree alive descends from that one mother tree. The Hass now accounts for 80% of cultivated avocados worldwide and produces fruit year-round. The mother tree itself, of uncertain subspecies, died of root rot and was cut down in September 2002. The avocado resists easy breeding. It is only partly self-pollinating because of dichogamy, a quirk where male and female flower phases fall at different times. A-cultivar flowers open as female on the first morning, then reopen as male on the second afternoon. B varieties reverse the schedule. Hass and Reed sit in the A group; Fuerte and Sharwil sit in the B group. Add a long juvenile period and the species becomes hard to improve. Most cultivars are propagated by grafting rather than seed, because a seed-grown offspring is unlikely to match its parent in fruit quality. A seedling can take four to six years to bear, sometimes ten. The cultivar names carry their own histories. Sharwil is a portmanteau of Sharpe and Wilson, developed by James Cockburn Wilson with Frank Victor Sharpe in Tamborine Mountain, Queensland, in the 1950s. Fuerte was commercialized in the United States from budwood imported from Atlixco, Mexico, in 1911, and ruled the American market for the first half of the 20th century.

• 6. Picked Hard, Sold Soft

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  In the 1980s, hidden supermarket camera footage showed shoppers squeezing hard, unripe avocados, putting them back in the bin, and leaving without buying. Gil Henry, a farmer of Escondido, California, responded by pioneering the ethylene gas ripening room, now an industry standard. The avocado is a climacteric fruit. Like the banana, it matures on the tree but ripens off it. Growers pick the fruit hard and green, then hold it in coolers at 3.3 to 5.6 degrees Celsius until it reaches its destination. Mexican growers pick Hass avocados once they pass 23% dry matter. At room temperature the fruit ripens in one to two weeks, faster beside apples or bananas because of their ethylene gas. The species also keeps its own clock. Hass tends to bear well only in alternate years, a pattern called biennial bearing, with a heavy crop followed by a poor one. Commercial orchards average seven tonnes per hectare, with some reaching twenty. Fruit can even be left on the tree for months, an advantage for growers chasing the best return, though if it hangs too long it falls. Sometimes the trees produce seedless avocados known in the industry as cukes, usually discarded for their small size.

• 7. The Cost Of Green Gold

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  It takes roughly 70 litres of applied fresh water to grow a single avocado, about 283 litres per kilogram, according to the Water Footprint Network. The figure depends entirely on place. In Chile's main growing region, one avocado needs about 320 litres, or 1,280 litres per kilogram. Those demands stack up against other crops. Avocados need three times the water of apples and eighteen times the water of tomatoes. In 2015, New York magazine reported that large avocado growers in Chile were draining the country's groundwater and rivers faster than they could refill. The Mexican state of Michoacán faces its own pressures, including water shortages, illegal deforestation, and water disputes. Mexico is the world's largest grower by far. In 2024, world production reached 11.2 million tonnes, led by Mexico with 25%, followed by Colombia, the Dominican Republic, Peru, and Indonesia. In Michoacán the trade carries a darker tax. Drug cartels extort protection fees from cultivators, reportedly 2,000 Mexican pesos per hectare plus 1 to 3 pesos per kilogram of fruit. The phrase blood guacamole was coined to describe the social cost of the world's appetite. A 2024 market analysis projected that as many as 30 countries will grow avocados, and that the fruit could become the world's most traded by 2030.

• 8. Flesh, Fat, And Poison

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  Raw avocado flesh is 73% water, 15% fat, 9% carbohydrates, and 2% protein. In a 100-gram amount it supplies 670 kilojoules and is a rich source of several B vitamins, including 28% of the Daily Value in pantothenic acid, plus 20% in vitamin K. About 75% of its energy comes from fat, most of it monounsaturated as oleic acid. Reviews of clinical research found that eating avocado may lower blood levels of low-density lipoprotein and total cholesterol. The fat content makes it a staple where other fatty foods are scarce, and a frequent meat substitute in vegetarian cooking. Yet the same plant can be dangerous. Avocado leaves contain persin, a toxic fatty acid derivative that can cause colic in horses and, without treatment, death. The leaves, bark, skin, and pit can severely harm or kill cats, dogs, cattle, goats, rabbits, birds, fish, and horses. The American Society for the Prevention of Cruelty to Animals lists the fruit as toxic to horses. Humans are not entirely safe either. Some people react with mouth and throat symptoms tied to tree-pollen allergy, while latex-fruit syndrome can bring urticaria, abdominal pain, vomiting, and reactions that are sometimes life-threatening. There is even a hazard in the kitchen. The term avocado hand describes the severe cuts people inflict on themselves while slicing the fruit, injuries that rose in the United States between 1998 and 2017 as consumption climbed. The leaves of Mexican avocados carry a gentler legacy, used as a spice with a flavor reminiscent of anise, toasted and crumbled into bean dishes or steeped as a tea.