Botanical Overview
Commonly known as Sweetflag, this species belongs to the Acoraceae family. This species holds a prominent place in the global materia medica, with an extensive record of traditional use spanning diverse cultures and medical systems. This species belongs to the Acoraceae family, a group of flowering plants.

General Description
It is a tall wetland monocot of the family Acoraceae, in the genus Acorus. Although used in traditional medicine over centuries to treat digestive disorders and pain, it has no clinical evidence of safety or efficacy and may be toxic if ingested, and so has been commercially banned for use in food in the United States.
Geographic Distribution
Sweetflag has been recorded in 10 countries and territories worldwide, including Belgium, Germany, Denmark, France, United Kingdom, and others.
Traditional Uses
Sweetflag has been traditionally used for digestive health, respiratory conditions, and pain and inflammation, among other applications.
Digestive health.
- Carminative
- Dyspepsia
- Ache(Stomach)
- Colic
- Diarrhea
- Stomachic
- Vermifuge
- Dysentery
For digestive complaints, the herb is typically prepared as a tea or decoction taken before meals. The bitter compounds stimulate digestive secretions and improve nutrient absorption. Some traditions use the powdered root or leaves in small doses as a stomachic tonic.
Respiratory conditions.
- Asthma
- Bronchitis
- Cold
- Cough
- Expectorant
Respiratory conditions are addressed through steam inhalation of the herb’s vapors or internal use as a warm tea. The hot infusion acts as an expectorant, helping to loosen phlegm and clear congestion. Some traditions combine it with honey for coughs.
Pain and inflammation.
- Ache(Head)
For pain and inflammation, preparations are applied both topically as compresses and taken internally. A warm poultice draws blood to the area and promotes healing, while internal preparations address systemic inflammation.
Active Compounds
Phytochemical research has identified 30 compounds in this species, including a diverse array of phytochemical classes (see the Complete Chemical Inventory below for the full list).
The identified compounds include the following categories:
- Alkaloid: nitrogenous compounds with diverse pharmacological activities