Tarragon is one of the defining herbs of French cuisine, prized for its distinctive anise-like flavor that pairs especially well with chicken, fish, eggs, and creamy sauces. Beyond the kitchen, it has a long history in traditional medicine as a digestive aid and appetite stimulant, and modern research has begun exploring its effects on blood sugar and inflammation.
Culinary Uses: A Cornerstone of French Cooking
Tarragon is one of the four herbs in the classic French blend known as “fines herbes,” alongside parsley, chervil, and chives. Its signature use is in Béarnaise sauce, the rich, buttery emulsion served alongside steak. It also stars in beurre blanc, a white butter sauce common with fish. In one of the most traditional preparations, chopped tarragon is mixed with softened butter and massaged beneath the skin of a whole chicken before roasting.
The herb works well with mushrooms, asparagus, salads, eggs, and vinaigrettes. Tarragon vinegar, made by steeping fresh sprigs in white wine vinegar, is a pantry staple in French households. The flavor is warm, slightly sweet, and gently licorice-forward, which means a little goes a long way. It’s best added near the end of cooking to preserve its aromatic oils.
Three Types of Tarragon (Only One Worth Buying)
French tarragon is the variety you want. It has a deep anise flavor and is the standard in professional kitchens. Russian tarragon, a closely related species, has almost no anise character at all. Most growers describe it as tasting like grass. If you’ve ever bought “tarragon” at a garden center and wondered why it had no flavor, you likely got the Russian variety.
Mexican tarragon is actually a type of marigold, not a true tarragon, but its flavor is remarkably similar to the French variety. It thrives in hot climates where French tarragon struggles, making it a practical alternative for gardeners in warmer regions who want a year-round supply.
Digestive Support and Appetite
Tarragon’s oldest and most consistent medicinal use is as a digestive aid. European herbalists have documented this role since at least the 1500s, when the physician Matthiolus described it as having a warming effect that stimulates the appetite. By the 1600s, Polish herbalists recorded that tarragon “strengthens the stomach” and stimulates digestion. In Central Asian and Russian folk medicine, it was used to treat gastritis, indigestion, and poor appetite, particularly when heavy meals of red meat were involved.
The herb contains compounds that act as antispasmodics in the digestive tract, which may explain why it has traditionally been used to ease stomach cramps and bloating. This is one reason tarragon pairs so naturally with rich, heavy foods: it was historically believed to make them easier to digest.
Blood Sugar and Metabolic Effects
Laboratory research has identified a specific extract from tarragon (known in studies as PMI-5011) that stimulates insulin release from pancreatic cells. In cell studies, this extract increased insulin secretion in a dose-dependent manner, with higher concentrations producing up to a fivefold increase compared to baseline. Animal studies have also shown the extract lowers elevated blood sugar levels and improves insulin sensitivity.
These findings are promising but still preliminary. The concentrations used in lab settings are far higher than what you’d get from adding tarragon to your dinner. Tarragon is not a substitute for diabetes management, but the research helps explain why this herb has appeared in traditional blood sugar remedies across multiple cultures.
Antibacterial Properties
Tarragon essential oil has demonstrated antibacterial activity in laboratory testing. One study evaluated it against two common foodborne pathogens, Staphylococcus aureus and E. coli, in both culture media and white cheese. The oil was effective against both bacteria, with S. aureus being more susceptible. Separate research found the oil also inhibits Listeria and Yersinia, two other bacteria associated with food contamination. These findings have generated interest in tarragon oil as a potential natural food preservative, though it’s not widely used in that capacity yet.
Sleep and Relaxation
Tarragon has been used in herbal medicine traditions to treat insomnia, and there’s a plausible biological explanation. The herb contains compounds that interact with GABA receptors in the nervous system, the same receptors targeted by many conventional sleep and anxiety medications. This gives tarragon a mild antispasmodic effect on both the nervous system and muscles. Tarragon tea before bed is a folk remedy in several cultures, though clinical trials specifically measuring its sleep benefits in humans are limited.
Best Substitutes When You’re Out
If a recipe calls for tarragon and you don’t have any, the best substitutes depend on what flavor you’re trying to preserve. For the anise note, fennel fronds work at a 1:1 ratio for fresh tarragon. Fennel seeds are much more concentrated, so start with just a tiny pinch per tablespoon of fresh tarragon called for. Chervil, another member of the fines herbes blend, substitutes at 1:1 and keeps the dish in the same flavor family. Fresh basil also works 1:1 and shares some of tarragon’s peppery sweetness.
Dill is a common swap at a 1:1 ratio, though it pulls the dish in a different flavor direction. For dried tarragon standing in for fresh, use one teaspoon of dried for every tablespoon of fresh. If you’re making Béarnaise and have no tarragon at all, simmering a half teaspoon of cinnamon with a tablespoon of parsley in a quarter cup of water creates a passable stand-in for the finishing stage.
Storing Tarragon to Keep Its Flavor
Fresh tarragon is delicate and loses its flavor quickly at room temperature. In the refrigerator, wrapped loosely in a damp paper towel inside a bag, it typically lasts about a week. For longer storage, freezing preserves the flavor far better than drying.
The simplest freezing method is to strip the leaves from the stems, spread them in a single layer on a baking sheet, and freeze them solid before transferring to a freezer bag. For cooking convenience, chop the leaves and freeze them in ice cube trays filled halfway with water. Once frozen, top off each cube with more water and store the cubes in a bag. You can also freeze chopped tarragon in oil: mix two cups of chopped herb with about a third of a cup of olive oil, spread the mixture flat inside a freezer bag, and freeze it as a thin sheet you can snap pieces from as needed. Frozen tarragon can be used in the same proportions as fresh.
A Note on Safety
Tarragon contains a compound called estragole, which has raised safety questions at high concentrations. The European Medicines Agency has recommended that exposure to estragole be kept “as low as practically achievable” in herbal medicinal products. In the amounts typically used in cooking, tarragon is considered safe. The concern applies mainly to concentrated supplements and essential oils taken internally over extended periods, not to the herb sprinkled over your chicken or stirred into a sauce.