Peanuts were never “discovered” in a single moment. They were domesticated by indigenous peoples in South America roughly 10,000 years ago, then carried across the globe by European colonizers and the transatlantic slave trade. The story of the peanut is less about one eureka moment and more about a slow, layered journey from wild plant to one of the world’s most important crops.
Wild Origins in South America
The peanut belongs to the genus Arachis, a group of plants native to a region that spans central Brazil and Paraguay. The cultivated peanut, Arachis hypogaea, is a hybrid. Its two parent species are wild plants called A. duranensis and A. ipaënsis, both diploid species that crossed naturally to produce the ancestor of every peanut grown today. That hybridization event happened somewhere in the lowlands east of the Andes, though the exact timing remains unclear.
What makes peanuts unusual among crops is how they reproduce. After the flower is pollinated above ground, the plant grows a stalk called a “peg” that curves downward and physically pushes the developing pod into the soil. The seeds then mature entirely underground. This process, called geocarpy, is rare in the plant kingdom and likely made peanuts harder for early humans to notice compared to fruits hanging from a tree or grain waving on a stalk. Someone, thousands of years ago, had to dig one up and try it.
The Oldest Archaeological Evidence
The earliest direct evidence of humans growing peanuts comes from the western slopes of the northern Peruvian Andes. Researchers excavated peanut macrofossils from preceramic archaeological sites and radiocarbon-dated them to between 9,240 and 5,500 years before the present. That puts peanut cultivation among the oldest known horticultural activities in the Americas, alongside squash and cotton, and suggests that farming economies in parts of the Andes were already taking root around 10,000 years ago.
By the time more complex civilizations developed along the Peruvian coast, peanuts had become culturally significant well beyond food. The Moche civilization, which flourished roughly from 100 to 700 CE in northern Peru, featured peanuts repeatedly in their art. Potters made ceramic pendants shaped like peanut shells, often using molds pressed from actual pods. Peanuts appeared in burial rituals and elite feasting contexts, suggesting they carried social prestige. Some of the most elaborate peanut-shaped objects were found in the tomb of the Lord of Sipán, one of the richest archaeological burials ever uncovered in the Americas.
How Peanuts Crossed the Atlantic
When Spanish and Portuguese explorers arrived in South America in the late 1400s and 1500s, they encountered peanuts already widely cultivated by indigenous peoples. The Spanish carried them to Europe and the Philippines. The Portuguese brought them to East Africa. In both cases, peanuts adapted well to tropical and subtropical climates and quickly became established crops in their new homes.
The route back to North America was far darker. Geographer Judith Carney has traced how the Portuguese transatlantic slave trade moved crops between continents. Peanuts, originally from South America, were introduced to West Africa by Portuguese traders. Slave-ship captains then purchased peanuts and other African food staples to feed enslaved people during the Middle Passage, calculating that familiar foods would improve survival rates on the voyage. Leftover rations were dispersed at port. Through this brutal circuit, a South American crop returned to the Americas via Africa.
Peanuts remained closely associated with slavery in the United States through the nineteenth century. They were grown primarily in the South and considered a food of the poor and enslaved, which slowed their adoption as a mainstream crop for decades.
George Washington Carver and the Peanut’s Rise
The peanut’s transformation into an American staple owes a great deal to George Washington Carver, a botanist and inventor at the Tuskegee Institute in Alabama. Carver’s concern wasn’t the peanut itself at first. He saw that Southern farmers were destroying their soil by planting cotton and tobacco in the same fields year after year, stripping out nutrients. He promoted crop rotation, urging farmers to plant peanuts and sweet potatoes, which restore nitrogen to depleted soil.
The problem was convincing farmers there was a market for all those peanuts. Carver’s answer was to compile a list of over 300 uses for peanuts, from peanut milk to dyes to cosmetics. His peanut massage oil gained real commercial traction and was reportedly used by President Franklin D. Roosevelt. In 1925, he received a U.S. patent for a cosmetic product described as a “pomade or vanishing cream made from peanuts,” which could be adjusted to any desired color, texture, or creaminess. Carver didn’t invent peanut butter (a common misconception), but his relentless promotion helped turn peanuts from a regional curiosity into one of America’s defining crops.
The Many Names for a Peanut
The peanut’s globe-trotting history left it with a tangle of names. In much of the English-speaking world outside the U.S., it’s called a groundnut, a straightforward reference to its underground growth. In the American South, the words “goober” and “goober pea” stuck, likely derived from “nguba,” a word for peanut in several Bantu languages carried to the U.S. through the slave trade. “Pindar” and “ground pea” also circulated in the Gulf Coast states. In Spanish, the word is “maní,” borrowed from the Taíno language of the Caribbean. The scientific name, Arachis hypogaea, translates roughly to “underground Arachis,” a nod to the same defining trait that every culture noticed first: this plant hides its fruit in the dirt.