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Oregano

life science Maturity 5-7 Next article →

Oregano, known scientifically as *Origanum vulgare*, is a woody perennial plant.

Origanum vulgare young plant 2
Origanum vulgare young plant 2

Perennial means the plant can live for many years. It belongs to the Lamiaceae family, which is the mint family. While it is native to the Mediterranean region, it has become naturalized in many temperate areas of the Northern Hemisphere. People value oregano for its culinary uses and its beauty as an ornamental plant.

S oregano
S oregano

Many cultivars have been bred specifically for their unique leaf colors or flower shapes.

The physical structure of oregano is quite distinct. The plant grows both tall and wide with spade-shaped, olive-green leaves. During the summer, it produces long flowers that grow in clusters called spikes.

Origanum vulgare inflorescence - Keila
Origanum vulgare inflorescence - Keila

These flowers can appear in shades of white, pink, or light purple. In some environments, oregano is grown as an annual plant. This happens in colder climates because the plant often cannot survive the winter freezes.

The intense flavor of oregano comes from its complex chemistry. The plant contains polyphenols, which include various types of flavones. Its essential oil is made mostly of monoterpenoids and monoterpenes.

OreganoEssentialOil
OreganoEssentialOil

Over 60 different chemical compounds have been identified in the plant. The most dominant ones are carvacrol and thymol, which can make up over 80% of the oil. Other compounds include limonene, pinene, and caryophyllene. The concentration of these oils changes based on the season and the location where the plant grows.

How we handle the plant after harvest changes its chemical makeup. Drying the plant material affects the amount and distribution of its volatile compounds. Using high heat or long drying times can have a negative impact on these oils. For example, fresh whole plant material may contain 33 g/kg of dry weight. After warm-air convection drying, this amount can drop to less than a third. Interestingly, the highest concentrations of these aromatic oils are found toward the end of the growing season.

Humans have developed many subspecies and strains over many centuries.

Majorana syriaca - za'atar
Majorana syriaca - za'atar

One common subspecies is *O. v. subsp. hirtum*, often called Greek or Italian oregano. It is vigorous, hardy, and has dark green, slightly hairy leaves. This version is widely considered the best for all-purpose cooking. Another subspecies, *O. v. subsp. gracile*, has glossy green leaves and pink flowers. It is often grown for ornamental beauty in pots. Some people even grow the 'Aureum' cultivar because it has golden foliage.

Oregano plays a massive role in global culinary traditions. It is a staple in Italian cuisine, used frequently with meats, fish, and vegetables. In the United States, it became a popular "pizza herb" after World War II. This happened because soldiers returned from Italy with a taste for it. In Mexico and Argentina, it is a key ingredient in many dishes. In Turkey, it is used to flavor meats like mutton and lamb. It is also a vital part of the Middle Eastern spice blend known as za'atar.

The history of the name "oregano" is also quite interesting. The English word is a borrowing from the Spanish *orégano*. This comes from the Latin *origanum*, which traces back to the Classical Greek *origanon*. There is a dispute regarding its ultimate origin. Some believe it comes from a Greek compound meaning "joy of the mountain." Others suggest it is a loanword because the plant originally came from Africa.

Bombus lucorum - Origanum vulgare - Keila
Bombus lucorum - Origanum vulgare - Keila

Even though it is used in folk medicine, the FDA has warned against making unproven health claims about oregano essential oil.

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🖼️ Images & Media (7)
File:Origanum vulgare inflorescence - Keila.jpg
Origanum vulgare inflorescence - Keila.jpg
File:Majorana syriaca - za'atar.jpg
Majorana syriaca - za'atar.jpg
File:Bombus lucorum - Origanum vulgare - Keila.jpg
Bombus lucorum - Origanum vulgare - Keila.jpg
File:S oregano.png
S oregano.png
File:Origanum vulgare young plant 2.JPG
Origanum vulgare young plant 2.JPG
File:Oregano (অরেগানো).JPG
Oregano (অরেগানো).JPG
File:OreganoEssentialOil.png
OreganoEssentialOil.png
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