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Tarragon

life science Maturity 7-9 Next article →

Tarragon, scientifically known as Artemisia dracunculus, is a perennial herb within the Asteraceae family. This plant is found growing wild across much of North America and Eurasia. Humans cultivate it for two primary purposes: culinary use in cooking and medicinal applications. The species name, dracunculus, translates to "little dragon." This name likely comes from the plant's coiled roots.

Dried Taragon
Dried Taragon

The plant features slender branches and glossy green, lanceolate leaves. These leaves are long and broad with entire margins. Tarragon is highly valued for its unique aromatic profile, which many people compare to anise.

The plant's growth and reproduction depend on its specific subspecies. French tarragon, or Artemisia dracunculus var. sativa, is the variety most prized for cooking. It possesses a strong, characteristic aroma. However, French tarragon rarely produces flowers or seeds because its flowers are often sterile. To grow more of this variety, gardeners must use root division. This process involves splitting the rhizomatous roots to create new plants. These rhizomes allow the plant to spread and reproduce readily through the soil.

Russian tarragon, known as Artemisia dracunculoides L., offers a different growth pattern. Unlike the French variety, it is a very hardy and vigorous plant. It can grow over one meter tall and thrives even in poor soil or drought conditions. While it can be grown from seed, its flavor is much weaker than French tarragon. In fact, its flavor diminishes as the plant ages. Some people use the young stems in early spring as a substitute for asparagus. Horticulturists often recommend growing these seeds indoors before planting them in the summer.

Another variety is Mexican tarragon, or Tagetes lucida. Although it shares a name, it is not in the same genus as the others. It is also called Mexican mint marigold or Texas tarragon. This plant provides a robust flavor with a hint of anise. It is a better culinary substitute for Russian tarragon because its flavor stays strong as it ages. However, it cannot grow as a perennial in cold climates. This distinction makes it different from the more cold-tolerant Russian and French varieties.

The distinct aroma of tarragon comes from specific chemical compounds. One major component is estragole, which provides the anise-like scent. Gas chromatography and mass spectrometry show that tarragon oil contains several phenylpropanoids. These include estragole at 16.2%, methyl eugenol at 35.8%, and trans-anethole at 21.1%. Other constituents include terpenes like limonene and alpha-pinene. The compound cis-pellitorin is also found in the plant and produces a pungent taste. Because these oils are highly volatile, they vaporize when the leaves are dried. This vaporization reduces the health risks associated with the oils and makes the herb easier to store.

Scientists have studied the safety of estragole carefully. In mice, estragole is known to be a carcinogen and a teratogen. Fresh leaves contain about 2900 mg/kg of this compound. However, an investigation by the European Union concluded that the actual danger to humans is minimal. Research on rat livers established a benchmark dose for a 10% increase in tumor rates. For a human weighing 80 kg, this would be roughly 400 mg of estragole per day. Since a typical culinary serving is only about 5 g of fresh leaves, the amount consumed is very low.

Tarragon has deep roots in many global cuisines. In French cooking, it is one of the four "fines herbes." It is a key ingredient in Béarnaise sauce and pairs well with fish, chicken, and eggs. In Georgia, it is used in the dish Chakapuli and to make a green soda called Tarkhuna. This drink is made from sugar, carbonated water, and tarragon leaves. In Syria, fresh leaves are eaten with white cheese. In Iran and Armenia, tarragon is used in stews and various pickles, such as khiar shoor. This variety of uses shows how central this aromatic herb is to many different cultures.

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