Why Were Potatoes Illegal in France? The Bizarre History of Europe's Most Important Crop

Were potatoes really banned in France?

The short, accurate answer: not by a parliamentary law, but by something almost as effective — an authoritative medical declaration that the public believed and acted on for nearly 25 years. In 1748, the Paris Faculty of Medicine (Faculté de Médecine de Paris) issued a declaration that potatoes were responsible for leprosy. Doctors, priests, and almanacs spread the warning. Farmers refused to plant them, markets refused to sell them, and households refused to cook them. The effect was indistinguishable from a legal ban — potatoes essentially disappeared from French agriculture for a generation.

Several reinforcing factors supported the rejection. Botanical confusion: potatoes belong to the Solanaceae (nightshade) family, the same family as the genuinely toxic deadly nightshade (Atropa belladonna) and the hallucinogenic mandrake. Religious suspicion: potatoes are not mentioned in the Bible, grew underground (associated in some folk traditions with the underworld), and reproduce vegetatively rather than from seed (which seemed unnatural). A real toxicology problem: green or sprouted potatoes contain solanine, a glycoalkaloid that can cause genuine nausea, vomiting, and skin issues. To eighteenth-century observers without modern toxicology, the symptoms of solanine poisoning could plausibly look like leprosy.

France was not alone. Most of Europe rejected potatoes as human food for 150–200 years after Spanish conquistadors first brought them back from Peru. Germany, Russia, and the United Kingdom all went through their own multi-decade rejection cycles before potatoes became staples. The full timeline is below.

How did potatoes arrive in Europe?

Potatoes were first cultivated in the high Andes of Peru and Bolivia approximately 8,000 years ago — one of the longest continuous domestications of any major food crop. The Inca Empire and its predecessors developed thousands of native varieties adapted to specific micro-environments along the Andean altitudinal gradient, from sea level to over 4,000 meters. Today the International Potato Center (CIP) in Lima preserves more than 4,350 accessions in its genebank, including over 3,000 native Andean varieties and 180+ wild species.

Spanish conquistadors first encountered potatoes during the 1532 conquest of the Inca Empire and brought them to Europe over the following decades. The full timeline of potato adoption across Europe and the world is below.

Source: CIP historical archives; FAO International Year of the Potato 2008 publications; Reader, John (2008) "Potato: A History of the Propitious Esculent"; Salaman, R.N. (1949) "The History and Social Influence of the Potato."

Who was Antoine-Augustin Parmentier?

Antoine-Augustin Parmentier (1737–1813) was a French pharmacist and agronomist born in Montdidier, Picardy. He trained as an apothecary and served in the French army medical corps during the Seven Years' War (1756–1763). The pivotal experience came when Parmentier was captured by the Prussians and held as a prisoner of war. Prussian POW camps fed prisoners almost exclusively on potatoes — the very crop the Paris Faculty of Medicine claimed caused leprosy. Parmentier survived. He emerged not only healthy but with a personal conviction that the French establishment was catastrophically wrong about potatoes.

Returning to France after the war, Parmentier dedicated the rest of his career to potato advocacy. In 1771 the Académie de Besançon held an essay contest on the question: “What plants could replace cereals during famine?” Parmentier won with his potato essay. The win gave him academic credibility and direct access to the Paris Faculty of Medicine. In 1772, after Parmentier's sustained lobbying and the supporting evidence from Prussian prisoners and German peasants, the Faculty formally reversed its 1748 declaration. Potatoes were no longer officially considered dangerous.

But the Faculty's reversal didn't change public behaviour. Twenty-five years of cultural conditioning had been absorbed; peasants still wouldn't plant potatoes; cooks still wouldn't prepare them; markets still wouldn't sell them. Parmentier needed something more dramatic. In 1785 he hosted his famous all-potato royal dinner at Versailles for Louis XVI and Marie Antoinette — soup, bread, dessert, all made from potatoes. The king reportedly wore potato flowers in his buttonhole and pinned one to Marie Antoinette's hair. The story spread rapidly through Paris society. But even royal endorsement wasn't enough on its own.

Parmentier's reverse psychology: the guarded potato field

Parmentier's decisive intervention was psychological, not nutritional. In 1786–87 he obtained a 40-acre plot at Sablons (an area near Neuilly, just outside Paris) and planted it with potatoes. He then made a request that bordered on absurd: he asked Louis XVI to provide armed royal guards to surround the field during daylight hours.

The optics worked exactly as Parmentier intended. Parisians watching from outside the field reasoned: if the King is paying soldiers to guard this crop, it must be valuable. The plot of supposedly worthless leprosy-causing weeds was suddenly the most prestigious piece of agriculture in France. Then Parmentier did something even more important: he removed the guards every night.

Within weeks, peasants from surrounding villages were sneaking into the field after dark and stealing potato plants — exactly as Parmentier hoped. The stolen tubers were planted in private fields across the Île-de-France. Within a decade, potatoes had spread from a few stolen plants at Sablons to a meaningful portion of French agriculture. Parmentier had inverted the rejection: instead of being told to eat potatoes (which French peasants resisted), they were stealing them (which French peasants embraced).

It is one of history's most elegant examples of behavioural design in food adoption. Parmentier understood that people resist being told what to eat, but desire what seems exclusive or forbidden. His method has been studied by social psychologists and marketing researchers ever since. He died in 1813 and was buried in Père Lachaise cemetery in Paris — where to this day, visitors regularly leave potato plants on his grave.

How did potatoes become Europe's most important crop?

Once cultural acceptance broke through, potato adoption exploded across Europe in the late 1700s and 1800s. The economics were overwhelming: a single acre of potatoes produces approximately 40,000 kcal of food energy versus around 15,000 for wheat — roughly 2.5x more calories per unit of land. For European peasants on small holdings during a period of rapid population growth, that calorie multiplier was the difference between subsistence and famine.

Historians estimate that 25–30% of European population growth between 1700 and 1900 is directly attributable to potato adoption (McNeill, 1999, “How the Potato Changed the World's History”). The crop arrived just as Europe began its long demographic expansion from approximately 100 million in 1700 to over 400 million by 1900 — and potatoes literally fed the difference.

National adoption pathways differed. Frederick the Great of Prussia took a more direct approach than Parmentier — he simply ordered Prussian farmers to plant potatoes on pain of nose-and-ear-cutting. (The Prussian potato adoption was thus rather faster than the French version.) Catherine the Great of Russia promoted potatoes through edicts in the 1760s but met sustained peasant resistance well into the nineteenth century. The Russian “potato riots” of the 1840s killed hundreds. Ireland, by contrast, embraced potatoes enthusiastically — with consequences explored below.

The Irish Potato Famine: when dependence went wrong

By the 1840s, the Irish population of approximately 8 million depended heavily on a single potato variety, the Irish Lumper — high-yielding, calorie-dense, and almost universally planted by Irish peasants on the small holdings that British landlordism had created. Potato dependence had reached approximately 10 lbs per person per day in the poorest counties. There was no genetic diversity in the crop. The Lumper was a clone, replicated vegetatively from generation to generation.

In 1845, Phytophthora infestans — the late blight oomycete — arrived in Ireland, likely transported on cargo ships from Mexico via North America. Ireland's genetically uniform Lumper crop had no resistance. The 1845 harvest collapsed. So did 1846. So did 1848. By 1852, approximately 1 million Irish were dead and another 1 million had emigrated — mostly to the United States. The Irish population fell by about 25% in seven years.

The famine's lesson reshaped global agricultural thinking: genetic uniformity in a staple crop is an existential vulnerability. The modern emphasis on genetic diversity in potato breeding, the founding of CIP in Lima in 1971, and the ongoing maintenance of the world's 4,350+ accession potato genebank are all direct downstream consequences of the Irish disaster. Late blight remains the most expensive potato disease today — approximately $6 billion per year in global losses — and the breeding pipelines at CIP, USDA-ARS, and the European Tri-State programs all explicitly target durable late blight resistance. See our diseases and pests guide and the late blight FAQ.

From rejected crop to global staple: potatoes today

Today the potato is the world's fourth most important food crop after rice, wheat, and maize. Global production reached 383 million tonnes in 2023 (FAOSTAT), grown across 160+ countries on every inhabited continent. China leads at 94.4 million tonnes, India follows at 56.2 million tonnes, and Ukraine ranks third at 22.5 million tonnes. France — the country that rejected potatoes in 1748 — today produces over 8 million tonnes annually and is one of the largest seed potato exporters in Europe.

The historical irony runs deep. France's pommes frites (French fries), gratin dauphinois, pommes purée (the Joel Robuchon technique), pommes boulangère, and aligot are now defining dishes of European cuisine. Two hundred fifty years after the Paris Faculty of Medicine declared potatoes a cause of leprosy, France hosts some of the world's most celebrated potato preparations. Belgium — Parmentier's neighbour — is the world's #1 frozen French fry exporter at $4.8 billion annually. The transformation from cultural rejection to culinary identity is total.

For deeper context, see our top producing countries guide, the per-capita consumption rankings, the varieties guide, and country profiles for France, Peru, Germany, Russia, Belgium, the United Kingdom, the Netherlands, and the United States.