Botanical Overview
Hemp Nettle (Galeopsis tetrahit) belongs to the Lamiaceae family. While not among the most extensively documented medicinal plants, this species has recorded uses that warrant attention from researchers and practitioners. The mint family (Lamiaceae) includes aromatic herbs and shrubs with square stems, opposite leaves, and two-lipped flowers. Many species produce essential oils in glandular trichomes on their leaves and stems. This family is one of the most important sources of culinary and medicinal herbs worldwide.
General Description
It is a herbaceous annual plant growing to 1 m tall; it is a pioneer species and thrives on disturbed sites or roadsides. The plant looks like mint but is taller. The stems have reflexed hairs and swollen nodes. In cross section, the stem is square. The leaves are rhombic to elliptic, with coarsely to bluntly serrate edges. The flowers are multicoloured, with purple, pink, or white areas; diminutive, bilateral and snapdragon-like, and are mostly visited by bumblebees. The species is considered by some authorities to have arisen as a natural hybrid between Galeopsis pubescens and Galeopsis speciosa.
Family Context
The Lamiaceae family is large and widely distributed. Notable medicinal members include:
- Basil — 86 documented uses
- Rosemary — 60 documented uses
- Agbo — 54 documented uses
- Sage — 49 documented uses
Geographic Distribution
Hemp Nettle has been recorded in 10 countries and territories worldwide, including Belgium, Switzerland, Germany, Denmark, France, and others.
Traditional Uses
Hemp Nettle has been traditionally used for respiratory conditions, urinary tract health, and nervous system disorders, among other applications.
Respiratory conditions.
- Expectorant
- Asthma
- Bronchitis
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.
Urinary tract health.
- Diuretic
Urinary tract applications typically involve drinking the herb as a mild tea, which increases urine production and helps flush the urinary system. It may be combined with other demulcent herbs to soothe irritated tissues.
Nervous system disorders.
- Spasm
Nervous system support involves taking the herb as a warm tea, often in the evening or before bed. The calming compounds interact with neurotransmitter systems to promote relaxation and restful sleep.
Active Compounds
Phytochemical research has identified 9 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:
- Flavonoid: antioxidant compounds that protect cells from oxidative damage