Durian is the most famously foul-smelling fruit in the world, banned from hotels, airlines, and public transit across Southeast Asia because of its overwhelming sulfurous stench. But it’s far from the only offender. Several fruits produce odors that range from rancid butter to aged cheese to rotting flesh, each for different biological reasons.
Durian: The Undisputed Champion
Durian’s smell is so potent that Singapore’s mass transit system posts signs explicitly banning the fruit from trains and buses. The odor has been compared to rotting onions, sewage, turpentine, and gym socks, sometimes all at once. What makes it so intense is an unusually high concentration of sulfur-based volatile compounds in the flesh. Researchers have identified more than 20 of these sulfur chemicals, and many of them individually smell terrible.
The strongest odor contributor, a compound called 1-(ethylthio)-ethanethiol, smells like roasted onion and registers the highest potency score of any volatile in the fruit. Other compounds contribute notes described as “skunky,” “sulfury,” “rubbery and burnt,” and “rotten egg.” Hydrogen sulfide, the same gas responsible for the smell of rotten eggs, is present alongside methanethiol, which smells like rotten cabbage. These chemicals combine to create durian’s signature wall of stench that can fill an entire room.
Despite the smell, durian is wildly popular in Southeast Asia and nutritionally dense. A single cup of the flesh delivers about 357 calories, over 1,000 milligrams of potassium (roughly a quarter of your daily need), and a solid dose of vitamin C, magnesium, and folate. Fans describe the taste as a rich, custard-like blend of sweet and savory. The gap between how durian smells and how it tastes is part of what makes it so fascinating and polarizing.
Noni: The Vomit Fruit
Noni, also called Morinda citrifolia, earns its nickname “vomit fruit” honestly. When ripe, it gives off a sharp, acrid odor that most people compare to strong cheese or actual vomit. The culprits are short-chain fatty acids, primarily butyric acid, hexanoic acid, and octanoic acid, the same compounds responsible for the smell of rancid butter, sweaty socks, and aged parmesan.
Noni has a long history in Polynesian and Hawaiian traditional medicine, where it’s been used as a health tonic for centuries. The trick to tolerating it is masking. When mixed into vinegar, stir-fries, or blended with other strong flavors, the smell and taste largely disappear. Noni vinegar made with rice or balsamic vinegar is one traditional workaround that makes the fruit practically unrecognizable.
Ginkgo Seeds: Sidewalk Stink Bombs
If you’ve ever walked under a female ginkgo tree in autumn and caught a whiff of something between rancid butter and vomit, you’ve encountered ginkgo seeds. The outer fleshy coating of these seeds is loaded with butyric acid, the exact same chemical that dominates the smell of vomit. Cities around the world have tried planting only male ginkgo trees to avoid the problem, but misidentified females still cause seasonal complaints on sidewalks and in parks.
The smell is concentrated in the soft, yellowish outer layer. Once that coating is removed, the inner nut is odorless and widely eaten in East Asian cuisine, roasted or added to soups and stir-fries.
Pawpaw: North America’s Smelly Native
The pawpaw is the largest edible fruit native to North America, and while it smells pleasantly tropical when perfectly ripe, it crosses into unpleasant territory fast. As pawpaws overripen, the concentration of certain volatile compounds nearly doubles. Esters that give the ripe fruit its mango-banana character begin breaking down, while butyric acid (that same cheesy, vomit-adjacent chemical found in noni and ginkgo) and hexanoic acid, described by researchers as simply “stinky acid,” become more prominent. The result is a yeasty, fermented, sour-cheese smell that intensifies by the day.
This narrow window between “delicious” and “foul” is one reason pawpaws have never been commercially successful despite tasting excellent at peak ripeness. They’re almost impossible to ship before they start to turn.
Why Some Fruits Evolved to Smell Terrible
Bad-smelling fruits aren’t design flaws. They’re targeted marketing campaigns aimed at specific animals. Durian’s powerful odor travels long distances through dense tropical forest, attracting large animals like elephants, orangutans, and fruit bats that can crack through its spiky shell and disperse its seeds far from the parent tree. The sulfur compounds that repel most humans are essentially a dinner bell for these animals.
The strategy is even more dramatic in some flowering plants. Certain “corpse flowers” produce the smell of rotting meat to attract carrion beetles and flies that normally feed on dung or dead animals. The insects land expecting a meal or a place to lay their eggs, pick up pollen, and leave empty-handed. The plant gets pollinated through pure deception. Foul smells, in other words, are a highly effective evolutionary tool for reaching the right audience, even if humans aren’t the intended recipients.
Fruits that smell bad when overripe, like pawpaw, serve a different function. The shift toward fermented, acidic odors signals to seed-dispersing animals that the fruit is at peak sugar content and ready to eat, while simultaneously warning that the window is closing. For animals with a less sensitive nose than ours, those “off” smells simply register as “ripe.”