What's a Clove, and Why Does One Bud Go So Far?
A few buds flavor a whole pot, so the real skill with cloves is counting them.
Cloves are the dried, unopened flower buds of an evergreen tree from Indonesia, and their oil is so rich in eugenol that a few buds can flavor a whole pot. Whole cloves suit slow infusions you can lift out, while ground clove belongs in baking and blends, measured by the pinch.
What are cloves?
The clove tree, Syzygium aromaticum, is an evergreen in the myrtle family native to the Maluku Islands of eastern Indonesia. Its buds are picked by hand before they open, then dried in the sun until they turn hard and dark brown.
The name comes from the Latin clavus, meaning nail, by way of the French clou, and one look at a dried bud shows why.
- Plant
- Syzygium aromaticum, an evergreen in the myrtle family
- Part used
- The unopened flower bud, dried
- Native range
- The Maluku Islands of Indonesia
- Essential oil
- About 15 to 20 percent of the dried bud by weight
- Main aroma compound
- Eugenol, usually most of the oil
- Largest producer
- Indonesia, followed by Madagascar
The ball at the top of each clove is the cluster of petals that never opened, and the tapering shank below it is the base of the flower. Harvesters wait until the bud has turned from green to pink but has not split, since an opened flower no longer makes a good clove.
That small bud carries an unusual amount of aroma for its size. About 15 to 20 percent of a dried clove's weight is essential oil, and eugenol usually makes up 70 to 85 percent of that oil.
Eugenol is behind almost everything a cook notices about cloves, from the warm smell to the numbing bite to the bitterness of a heavy hand.
Cloves were one of the great prizes of the spice trade for more than two thousand years. Courtiers of the Han dynasty in China chewed them to sweeten their breath before speaking to the emperor.
The Dutch East India Company later destroyed unauthorized clove trees to keep the supply under its control.
French officials smuggled seedlings out in 1770, and by the end of the nineteenth century Zanzibar grew about nine-tenths of the world's cloves.
Indonesia is again the largest grower by far, with more than five times Madagascar's output in 2023. Most of its harvest goes into kretek, the clove cigarettes that dominate the Indonesian tobacco market, so the country still imports cloves on top of what it grows.
What do cloves taste like, and why do they numb your mouth?
Sweet, hot and woody is the usual description, with a faint bitterness at the back of the tongue. The heat is not chili heat, since cloves contain no capsaicin.
That warmth comes from eugenol, which also produces a spreading numbness when you bite a bud.
Eugenol acts as a mild local anesthetic. Dentists have used it since the nineteenth century, most familiarly in temporary fillings made from zinc oxide and eugenol, and that is where the "dentist's office" smell comes from.
At cooking amounts the numbness is harmless and passes quickly.
The rest of the oil is mostly eugenyl acetate, up to about 15 percent, and beta-caryophyllene, one of the compounds behind the smell of black pepper, which adds a woody note.
Those three together make up about 99 percent of clove bud oil, which leaves very little in a clove to soften eugenol once it takes over.
The same concentration explains the bitterness of too many cloves. In a small dose eugenol reads as warmth behind other flavors, but past a certain point nothing in the spice rounds it off, and the dish starts to taste medicinal.
Eugenol is not unique to cloves.
Allspice, bay leaf, basil, nutmeg and cinnamon all carry some of it, and allspice carries enough to pass for clove in a spice cake.
Flavors that soften clove are the ones it pairs with best. Cinnamon sticks, orange peel, ginger, black pepper, dark sugar and fat all round off its edge, which is why clove so rarely appears on its own.
Should you use whole or ground cloves?
The two forms do different jobs. Whole cloves release their oil slowly into liquid and can be lifted out, while ground cloves release everything at once and stay in the dish.
That difference settles most clove questions before any measuring starts.
| Form | How it releases flavor | Best for | Watch for |
|---|---|---|---|
| Whole buds | Slowly, over a long simmer or steep | Rice, braises, stocks, mulled drinks, pickles | A hidden bud in someone's mouthful |
| Ground from a jar | Immediately and evenly | Baking, rubs, blends, smooth sauces | Too much cannot be taken out |
| Freshly ground | Immediately, with brighter top notes | Small batches of garam masala or cake spice | A grinder that smells of clove afterward |
Whole cloves are edible, but biting one is unpleasant. The bud is hard and woody, and it releases a burst of eugenol that numbs the tongue and drowns out the food around it.
Cooks handle that the same way they handle bay leaves, by making the cloves easy to find again.
The classic French method pins a bay leaf to a halved onion with a few cloves, the oignon piqué used to flavor béchamel and stock. A muslin bag does the same job in a dark braise, and a glazed ham carries its cloves on the surface where everyone can see them.
Ground cloves have no exit, and that puts all the pressure on measuring. They still reward home grinding when the batch stays small, because one or two fresh buds make more powder than most dishes need.
The liquid a clove sits in changes how fast it gives up its flavor. Eugenol mixes freely with alcohol and dissolves readily in fat, but water holds only about 2.5 grams of it per liter.
That difference fits two old habits, frying whole cloves in hot ghee at the start of a biryani and steeping them in wine for mulled drinks.
The ghee then coats every grain of rice cooked in it, and that carries the clove through the whole pot.
How many cloves should you use?
Recipes for a pot of rice or a stew serving four usually call for two to four whole cloves. Ground clove is measured in fractions of a teaspoon, and a quarter teaspoon is enough to flavor a whole cake.
| Dish | Whole cloves | Ground clove |
|---|---|---|
| Rice or pilaf for four | 2 to 4 buds | Rarely used |
| Braise or stew for four | 2 to 4 buds | A pinch at most |
| Mulled wine, one bottle | 4 to 8 buds | Avoided, it clouds the drink |
| Pickles, one quart jar | 2 to 4 buds | Avoided, it clouds the brine |
| Spice cake or gingerbread | Not used | 1/4 to 1/2 teaspoon |
| Garam masala with 2 tablespoons cumin | 6 to 8 buds, then ground | Part of the blend |
One whole clove is roughly equal to an eighth of a teaspoon of ground clove, though the whole bud gives up its oil far more slowly.
Time matters as much as the count because a clove keeps extracting for as long as it sits in hot wine or a thin broth. A drink that tasted right after twenty minutes can turn bitter after an hour on the stove.
Rice, flour, butter and cream spread eugenol through a lot of bulk, which is why a cake can carry more clove than a clear soup of the same size.
Where do cloves belong in cooking?
Almost every cuisine that uses cloves treats them as a supporting note. They show up in spice blends, long braises and sweet baking, and cinnamon is nearly always somewhere nearby.
| Cuisine or dish | How clove is used | Its usual partners |
|---|---|---|
| Indian biryani and pilaf | Whole buds fried in ghee at the start | Cardamom, cinnamon, bay |
| Garam masala | A small share of a toasted, ground blend | Cumin, coriander, cardamom, pepper |
| Chinese five-spice | About half a part in the blend | Star anise, cassia, fennel, Sichuan pepper |
| Vietnamese pho | Whole buds toasted for the broth | Star anise, cinnamon, charred onion |
| Mexican mole and adobo | Ground with dried chiles | Cinnamon, allspice, cumin |
| European baking and ham | Ground in gingerbread, whole in a ham glaze | Cinnamon, ginger, nutmeg |
| Mulled wine and cider | Whole buds steeped for a short time | Orange peel, cinnamon stick |
In garam masala and Chinese five-spice, clove is the most concentrated ingredient in the jar, which is why the ratios keep it small. Home recipes for pumpkin pie spice use it by the half part for the same reason.
Pickling is the one place clove stays whole almost by necessity.
Ground spice would cloud a brine and settle at the bottom of the jar, so most pickling spice blends carry a few whole buds instead.
Clove rarely suits delicate food on its own. Fish, green vegetables and light broths expose its medicinal edge quickly, while rich meat, dried fruit, chocolate and dark sugar give it something to lean on.
What can you substitute for cloves?
Allspice is the closest of the clove substitutes because its oil is also led by eugenol. The two trees share the myrtle family but belong to different genera, and allspice brings a rounder, peppery warmth without the same numbing edge.
| Substitute | Starting amount per 1 tsp ground clove | What changes |
|---|---|---|
| Allspice | 1 tsp, up to 2 tsp for full strength | Rounder and less numbing |
| Pumpkin pie spice | 1 tsp | Adds cinnamon, ginger and nutmeg |
| Cinnamon | 1 tsp | Sweeter and woodier, with no numbing edge |
| Nutmeg | 1/2 tsp | Nuttier and softer |
| Cardamom | 1/2 tsp | Brighter and more floral |
| Leaving it out | Nothing | Barely missed where a savory recipe used one or two buds |
Two or three allspice berries per whole clove do the same job in a braise or brine, and they come out the same way.
Sweet dishes are easier to cover than savory ones. Cinnamon, grated nutmeg and orange zest rebuild the warmth in a cake, but a broth that relied on clove for depth usually tastes better with the clove left out than with a strong stand-in.
In rice, a green cardamom pod and a piece of cinnamon stick cover a missing clove better than any ground powder.
How are cloves graded, and does origin matter?
Grading rules judge cloves by how much oil the buds still hold and how many damaged or look-alike pieces are mixed in. Origin shifts the balance of the oil only a little, because bud oil from Indonesia and Madagascar, the two largest growers, is led by eugenol in both cases.
The clearest public numbers come from India's standard for cloves, IS 4404, revised in 2010 to line up with the international ISO 2254 standard.
| Check | What it catches | Limit for whole cloves |
|---|---|---|
| Volatile oil | How much aroma the buds still carry | At least 17 ml per 100 g, dry weight |
| Headless cloves | Buds that lost their round head | 2 percent by weight at most |
| Mother cloves | The ripe fruit, an oval brown berry | 2 percent at most, together with tendrils |
| Khoker cloves | Buds that fermented because they dried too slowly | 2 percent at most |
| Moisture | Water left after drying | 10 percent at most |
| Extraneous matter | Dirt, other plant parts and exhausted cloves | 1 percent at most |
Europe's spice trade body asks for the same 17 milliliters per 100 grams in whole cloves but accepts 14 in ground clove. That lower bar means a jar of powder can start out weaker than the whole buds beside it.
Khoker cloves are easy to spot once you know the look. They turn pale brown with a whitish, mealy surface when the buds ferment before they finish drying.
Exhausted cloves are a deliberate fraud rather than a harvest defect.
They are buds that already went through a still for their oil and were then dried and mixed back in with sound cloves. In the bag they look small and shrunken, smell faint when cracked and add nothing but weight.
Ground clove hides all of these defects. Export guidance notes that lower-quality cloves can go into powder, which is one reason ground clove often costs less than whole.
Steam sterilizing, which European buyers increasingly ask for, also lowers the oil content.
Origin labels carry less information than they seem to. A 2014 study of 121 commercial clove oils found that bud oil from Madagascar was 72 to 81 percent eugenol and bud oil from Indonesia 77 to 82 percent.
Madagascar oils did carry more eugenyl acetate, 12 to 21 percent against 9 to 11. Those figures describe distilled oil rather than a braise, so the grade and age of a bag are a better guide to strength in the pot than the country on the label.
Madagascar is the leading supplier of cloves to Europe, ahead of Indonesia and Sri Lanka, since Indonesia keeps most of its far larger harvest at home.
How do you buy and store cloves?
Good whole cloves are dark reddish brown, with most of their round heads intact. A fresh bud pressed with a fingernail leaves a trace of oil and gives off a strong, sweet smell.
Loose stems are the cheap filler to watch for. The stalks of the flower cluster carry far less aroma than the buds, and US rules treat cloves with an average of 5 percent or more stems by weight as adulterated.
- Intact headsMost buds still carry the round ball at the top, a sign of careful drying and handling.
- Few loose stemsThin twig pieces in the bag add weight and very little aroma.
- Oil when pressedA fresh bud feels slightly oily and smells strong when cracked.
- Sinks in waterIndia's food regulator describes a quick check in which sound cloves settle to the bottom of a glass of water and exhausted cloves float.
- Small jars of groundGround clove goes by the pinch, and a small jar is finished before it fades.
A clove that smells faint when cracked will taste faint in the pot, and adding more tired buds mostly adds bitterness.
Whole cloves hold their oil far longer than powder does, for the reasons behind most whole versus ground choices. The shelf life chart puts whole cloves at the long end of the range and ground cloves in the middle.
A sealed jar kept away from the stove's heat is all cloves need, as with most stored spices.
What if you added too much clove?
Too much clove is fixed by dilution rather than by covering it up. Another strong spice adds a second loud flavor on top of the first, while plain starch, fat or more of the unseasoned base lowers the eugenol in every spoonful.
Removal comes first whenever the cloves went in whole.
| Dish | Repair | What makes it worse |
|---|---|---|
| Rice | Remove the buds and stir in a batch of plain rice | More cinnamon or cardamom |
| Stew or braise | Add potato, beans or unseasoned stock | Simmering on with the buds still in |
| Mulled drink | Strain, then top up with juice or wine | Leaving the buds to steep |
| Curry base | Add tomato, yogurt or coconut milk | More ground warm spice |
| Baked goods | Serve with cream, yogurt or plain fruit | Extra sugar, which hides bitterness but not numbness |
Blended sauces are the trap, since a whole clove that goes into the blender ends up spread through every spoonful.
Acid needs care in savory food, because citrus or vinegar can make the clove edge feel sharper in a thin sauce.
Ground clove allows only one repair, which is more base. That is the reason it gets measured over a small dish rather than straight over the pot.
Are cloves safe to eat, and who should be careful?
Ordinary cooking amounts of clove are treated as safe by food regulators. US rules list cloves and their oils among substances generally recognized as safe when they are used to flavor food.
An expert committee of the United Nations food and health agencies set an acceptable daily intake for eugenol of up to 2.5 milligrams per kilogram of body weight. For a 70-kilogram adult that comes to about 175 milligrams a day.
A level teaspoon of ground clove weighs about 2 grams, and by the oil and eugenol figures above it holds very roughly 200 to 350 milligrams of eugenol.
A spice cake made with half a teaspoon therefore spreads something like 100 to 175 milligrams of eugenol across the whole cake. A single slice carries only a small share of the daily figure.
Health references say there is not enough reliable information to know whether larger, medicinal amounts of clove are safe, including during pregnancy and breastfeeding, and they advise sticking to food amounts.
Eugenol also seems to slow blood clotting. For that reason, the same references caution people with bleeding disorders or on blood-thinning drugs about clove oil and concentrated clove products, and suggest stopping medicinal clove two weeks before surgery.
Whole or ground cloves in food carry nothing like that dose.
The warning is about the bottle of oil, which is sometimes kept in the same cupboard as the spice.
Dabbed on the gums for a toothache, clove oil can also irritate or damage the gum tissue, and a burn of the mouth lining has been reported from a concentrated preparation.