Basil vs. Oregano: Fresh and Delicate vs. Dried and Hearty

Basil and oregano are both mint-family herbs and both belong in a tomato sauce, but they behave differently in the pot. Oregano’s flavor rests on two phenols, carvacrol and thymol, which make up roughly 78–85% of its essential oil,¹ and it holds up to long cooking and drying.²³ Basil’s oil is led by methyl chavicol (estragole),⁴ and it is a delicate herb that is at its best fresh and added late.⁵⁶

Side by side

The flavor row is our description. It is consistent with the sources: The Spice House says basil lends a sweeter taste and oregano a more earthy one,¹⁴ and Britannica describes Greek and Italian culinary oreganos as having a strong aroma and a warm, pungent taste.¹⁰

The chemistry, sample by sample

Each figure below belongs to the oil it was measured on. They are essential-oil figures, not measurements of the dried leaf, and they come from different studies.

Basil varies widely by type, and oregano by subspecies and growing conditions, so neither has a single typical value.⁴¹ What the table does show is that the two herbs share no lead compound, which is why one never tastes like the other.

The differences that change a dish

Fresh or dried, early or late

This is the practical split. America’s Test Kitchen classes oregano as a hearty herb to add early in cooking,² and in its dried-versus-fresh tests dried oregano did reasonably well in dishes with fairly long cooking times and a good amount of liquid.³ Basil is the opposite: ATK lists it among herbs that are much weaker in flavor when dried,⁶ and LSU AgCenter puts it with the delicate herbs best added a minute or two before cooking ends.⁵ Britannica notes that dried common basil is less fragrant and more pungent than fresh.⁹

In a long-simmered tomato sauce, then, oregano can go in at the start and basil near the end. For long-simmered dishes, the University of Delaware’s gentler rule is to add herbs during the last 45 minutes,¹¹ and it notes that dried herbs are stronger than fresh.¹¹

Mexican oregano is a different plant

A widely repeated point says oregano, not basil, is the herb of Mexican cooking. That oregano is usually Mexican oregano, which Britannica notes belongs to a different botanical family, the Verbenaceae.¹⁰ See Mexican oregano vs. oregano.

Pizza

Britannica calls oregano essential in Italian pizza and pasta sauces, and says it became widely known in the United States after World War II, when returning soldiers who had developed a taste for Italian food made it popular.¹⁰ Basil goes onto pizza too; PROSEA lists pizzas first among its Italian uses.⁴

Nutrition

Source: USDA FoodData Central;¹⁵¹⁶ per-teaspoon figures and percentages are our arithmetic against FDA Daily Values.¹⁷ Per 100 g, dried basil carries 1,710 µg of vitamin K and dried oregano 622 µg, many times the Daily Value of 120 µg.¹⁵¹⁶¹⁷ But a teaspoon weighs about a gram, so at seasoning amounts vitamin K is the only nutrient either supplies in a noticeable amount, and neither is a real source of B vitamins: oregano’s thiamin per 100 g (0.177 mg) is about twice basil’s (0.080 mg), while basil has slightly more niacin (4.90 mg against 4.64 mg).¹⁵¹⁶

Can one stand in for the other?

Often, in tomato-based Italian dishes; less so elsewhere.

• Basil in place of oregano. A Couple Cooks says to use equal parts of fresh or dried basil for fresh or dried oregano (Attributed).¹⁸ The Spice House suggests basil for Greek or Mediterranean oregano.¹⁴ Our oregano substitutes page uses the same 1:1 and notes that basil suits tomato sauce and pizza better than Greek salads or grilled meat, where oregano’s bite is the point.
• Oregano in place of basil. No published ratio was found (Method). In a cooked tomato sauce, start with about half the basil amount of dried oregano and taste, since dried herbs are stronger than fresh.¹¹ It does not work in pesto, a caprese salad or anywhere fresh basil is the garnish (editorial).
• Fresh and dried of the same herb. ATK’s tests found 1 part dried herb to 3 parts fresh came closest to equal flavor (Computed, general rule for herbs).³ See fresh oregano vs. dried and dried basil vs. fresh.

What isn’t known

• No published measurement compares the strength of dried basil and dried oregano, so the oregano-for-basil amount is a starting point.
• A widely repeated claim says oregano keeps its nutrients better than basil because it is dried soon after harvest; we found no source for it.
• We found no source for oregano being “the single most noticeable” herb in pizza sauce, or for what most chefs prefer.

Related

• Profiles: basil, oregano, marjoram
• Oregano substitutes and Italian seasoning
• Comparisons: marjoram vs. oregano, oregano vs. thyme, basil vs. mint, basil vs. parsley, oregano vs. parsley
• Basil uses, cooking with basil, too much oregano