Ingredient guide
Mexican Oregano
Botanically unrelated to the Mediterranean herb of the same name, Mexican oregano has a bolder, citrusy, slightly licorice-like edge that stands up better to cumin and chile than its Italian counterpart does.
- What it is
- Despite the shared name, Mexican oregano (Lippia graveolens) is a different plant family entirely from Mediterranean oregano (Origanum vulgare) — it's a member of the verbena family, native to Mexico and the American Southwest. It's sold dried, usually as crumbled leaf, and is a staple in the spice aisle of any Mexican grocery store, often in a clear bag rather than a jar.
- Flavor
- Stronger and more assertive than Italian oregano, with citrusy, slightly floral, and faintly licorice or anise-like notes layered over the familiar oregano bitterness. It holds its own against bold, cumin-and-chile-forward seasoning in a way milder Mediterranean oregano can get lost in.
- In fajitas
- A small amount of Mexican oregano rounds out a fajita seasoning blend or marinade, adding a savory, slightly bitter herbal note that keeps the cumin and chile from tasting one-dimensional. It's a background player rather than a headline flavor, but leaving it out of an otherwise correct recipe makes the seasoning taste noticeably flatter.
- How to choose
- Buy crumbled leaf rather than pre-ground powder when possible — it holds aroma longer, and you can crush it between your fingers right before adding it to release oils. Look for leaves that are green-gray rather than faded brown, and avoid bags that feel powdery or dusty at the bottom, a sign of age.
- Storage
- Store in a sealed container away from light and heat; whole crumbled leaf keeps good flavor for about a year, noticeably longer than pre-ground oregano powder. Crush leaves between your palms just before adding them to a dish rather than crushing the whole container at once, to preserve aromatic oils in the unused portion.
- How much
- About 1/2 to 1 teaspoon dried Mexican oregano is typical in a fajita seasoning blend sized for 1.5-2 lbs of meat — a little goes a long way given its stronger flavor than Italian oregano.
- Fresh vs dried
- Mexican oregano is used almost exclusively dried in the U.S. market; fresh Lippia graveolens is rarely sold outside Mexico and parts of the Southwest, so recipes calling for it mean the dried, crumbled form.
Some links may earn FajitaRecipe.com a commission if you buy through Amazon, at no extra cost to you.
Substitutes: Mediterranean/Italian oregano (milder, less citrusy — use slightly more to compensate); Marjoram (softer, sweeter, not a close match but usable); Epazote in very small amounts for a different but complementary Mexican-herb note.
Why the substitution isn't perfect
Because Mexican oregano and Italian oregano come from entirely different plant families, swapping one for the other changes the dish's flavor rather than just its intensity — Italian oregano brings a sweeter, more Mediterranean pine-and-mint quality, while Mexican oregano brings citrus and anise. If a recipe specifically calls for Mexican oregano and only Italian is on hand, using slightly less Italian oregano and adding a small pinch of ground cumin or a few coriander seeds can approximate the missing citrus note, though it won't be identical.
Where to actually find it
Mexican oregano is not always stocked in the standard spice aisle of a mainstream grocery store; it's far more reliably found in the Latin/Hispanic foods section, at a dedicated Mexican grocery (often sold loose or in large clear bags rather than small jars, and noticeably cheaper by weight), or online. If a store carries only one oregano and the label doesn't specify "Mexican," it's almost certainly the Mediterranean variety.
Sources & further reading
- Lippia graveolens (Mexican Oregano) — USDA Agricultural Research Service, Germplasm Resources Information Network. Botanical classification distinguishing Mexican oregano from Origanum species.