Cucumber

• 1. Introduction

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  The cucumber, known to botanists as Cucumis sativus, is 95% water. That single fact hides a much stranger story. This creeping vine in the family Cucurbitaceae has been cultivated for at least 3,000 years, and somewhere along the way it earned both an emperor's devotion and a reputation as a near-poison. The Roman Emperor Tiberius wanted it on his table every single day, summer and winter alike. Centuries later, an English diarist would record a man's death blamed on eating it. How did one mild, watery fruit travel from the foothills of India across most of the world's continents? Why did Roman gardeners build wheeled beds and glaze frames with sheet mica to chase it through the seasons? And why, in botanical terms, is this so-called vegetable actually a berry? The answers run through bees, brine, royal gardens, and the trappers who carried it across the Great Plains.

• 2. Berry In Disguise

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  Cucumber fruits consist of 95 percent water, and in botanical terms the plant is classified as a pepo, a type of berry with seeds and an outer rind. In a culinary context, though, it is treated as a vegetable, which is how most people meet it. The fruit of typical cultivars is roughly cylindrical, elongated with tapered ends, and can reach as large as 62 cm long and 10 cm in diameter. The plant itself is an annual creeping vine. It roots in the ground and climbs trellises or other supporting frames, wrapping around supports with thin, spiraling tendrils. Without a structure to climb, it will simply sprawl along the ground, its large leaves forming a canopy over the fruits below. The plant can even root in a soilless medium. In a reference amount of 100 grams, raw cucumber provides 65 kilojoules of food energy. Its micronutrient content is low, notable only for vitamin K at 14 percent of the Daily Value, a slim profile for a fruit that has commanded so much attention.

• 3. Roots In Asia

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  India, Nepal, Bangladesh, the Chinese provinces of Yunnan, Guizhou, and Guangxi, and Northern Thailand together form the region where the cucumber originates. Cucumis sativus was domesticated in India from the wild C. sativus var. hardwickii, where a great many varieties have been observed alongside its closest living relative, Cucumis hystrix. From this Asian cradle the plant spread until it grew on most continents, traded across the global market. Demographic modelling suggests the East Asian cultivars diverged from the Indian ones about 2,500 years ago. The crop branches into three main cultivar groups by region: Eurasian cucumbers eaten raw and immature, East Asian cucumbers used for pickling, and Xishuangbanna cucumbers. It was probably introduced to Europe by the Greeks or Romans. Records of cultivation then surface in France in the 9th century, England in the 14th century, and North America by the mid-16th century. Today world production tells a lopsided story. In 2024, world production of cucumbers and gherkins was 88 million tonnes, led by China with 78 percent of the total.

• 4. The Emperor's Obsession

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  According to Pliny the Elder, the Emperor Tiberius had the cucumber on his table daily during summer and winter, and was reportedly never without it. To make that possible, the Romans turned to ingenuity that resembled an early greenhouse. They built raised beds in frames upon wheels, so the cucumbers could be moved into the full heat of the sun and, in winter, withdrawn and placed under frames glazed with mirrorstone. That mirrorstone was Pliny's lapis specularis, believed to have been sheet mica. The plants were cultivated in specularia, cucumber houses glazed with oiled cloth. Pliny describes the vegetable as very small, probably much like a gherkin. He also writes about several other varieties and the remedies drawn from each, counting 9 remedies from the cultivated cucumber, 5 from the anguine, and 26 from the wild. Separately he describes a medication called elaterium, though this may have come from a different species, Ecballium elaterium, known before Linnaeus as Cucumis silvestris or Cucumis asininus, the donkey cucumber.

• 5. Crossing The Atlantic

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  Charlemagne had cucumbers grown in his gardens in the 8th or 9th century, keeping the plant alive in the medieval European table. England's relationship with it was stranger: the cucumber was reportedly introduced there in the early 14th century, lost, then reintroduced roughly 250 years later. The leap across the ocean came with the Columbian exchange. The Spaniards, through the Italian Christopher Columbus, brought cucumbers to Haiti in 1494. The plant moved inland from there. In 1535, the French explorer Jacques Cartier found very great cucumbers growing on the site of what is now Montreal. Throughout the 16th century, European trappers, traders, bison hunters, and explorers bartered for the products of American Indian agriculture. The tribes of the Great Plains and the Rocky Mountains learned from the Spanish how to grow European crops. Farmers including the Mandan and the Abenaki obtained cucumbers and watermelons from the Spanish and folded them into crops they already grew, among them several varieties of corn and beans, pumpkins, squash, and gourds. The Iroquois were already growing them when the first Europeans visited.

• 6. Fit To Be Thrown Out

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  Samuel Pepys wrote in his diary on the 22nd of August 1663 that Sir W. Batten had told him Mr. Newburne was dead of eating cowcumbers, and that he had heard of another such case only days before. The fruit's reputation did not improve quickly. In 1699, John Evelyn wrote that the cucumber, however dressed, was thought fit to be thrown away, being accounted little better than poison. The 18th-century British lexicographer and wit Samuel Johnson recorded a common saying among English physicians: that a cucumber should be well sliced, dressed with pepper and vinegar, and then thrown out, as good for nothing. Yet earlier colonial voices had been kinder. In 1630, the Reverend Francis Higginson wrote in New-Englands Plantation that the country abounded with roots of great variety and good to eat, listing pompions, cowcumbers, and other things of that nature. In New England Prospect of 1633, William Wood praised the kitchen gardens for their coucumbars and muskmillons, many things being better and larger than in England.

• 7. Bees And Bitterness

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  Thousands of honey beehives are carried to cucumber fields each year just before bloom, a quiet annual migration in service of the crop. Most cucumber cultivars are seeded and require pollination, and most of those are self-incompatible, needing pollen from another plant to set seeds and fruit. Bumblebees and several other wild bee species can do the job too. Some self-compatible cultivars exist, related to the Lemon cucumber. Traditional cultivars produce male blossoms first, then female, in roughly equal numbers. Newer gynoecious hybrid cultivars produce almost all female blossoms, often with a pollenizer cultivar interplanted and more beehives per unit area, though a temperature change can induce male flowers even on these. Other cultivars are parthenocarpic, creating seedless fruit without pollination, and are often grown in greenhouses, where fruit set still rises when bees visit. The plant also defends itself. Cucumbers produce cucurbitacin C, which causes the bitter taste in some varieties, a possible chemical deterrent against insects, nematodes, and wildlife under preliminary research in the leaves, cotyledons, pedicel, carpopodium, and fruit. That same family of compounds, the cucurbitacins, gives the rind its slightly bitter edge.

• 8. Slicers, Picklers, Gherkins

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  Cucumbers grown to eat fresh are called slicing cucumbers, and the ones grown for the North American market tend to be longer, smoother, more uniform in color, with much tougher skin. Elsewhere, smaller European cucumbers carry thinner, more delicate skin and often fewer seeds, so they are sold wrapped in plastic for protection; in Australasia this is the telegraph cucumber. Pickling cucumbers are shorter, thicker, and thinner-skinned, made into flavored products with brine, sugar, vinegar, and spices. Gherkins, cornichons, or baby pickles are small cucumbers, typically 1 to 5 inches long and often bumpy-skinned, used for pickling. The word gherkin comes from the early modern Dutch gurken or augurken, meaning small pickled cucumber, and lends its name to Cucumis anguria, the West Indian gherkin. Burpless cucumbers are sweeter, thinner-skinned, nearly seedless, and can grow as long as 2 feet, usually raised in greenhouses and sold shrink-wrapped. Beyond the fruit, cucumber shoots are regularly eaten as a vegetable, especially in rural areas. In Thailand they are often served with a crab meat sauce, stir fried, or used in soups. The plant that Carl Linnaeus described in 1753 in his Species Plantarum remains the sole member of its genus to carry 2N equals 14 chromosomes, and in 2009 its genome was sequenced, opening the species to a high-resolution study of its meiotic DNA double strand-breaks and genetic crossovers.