The bush mint that heals!

Hyptis suaveolens (L.) Poit.  [syn. Mesosphaerum suaveolens (L.) Kuntze]

Family – Lamiaceae

Common names: Bush mint, pignut, chan, wild spikenard, daddoya-ta-daji (Hausa), nchanwu-ofia/nchuanwu-elu (Igbo), efinrin-wewe and jogbo (Yoruba).

A strongly aromatic annual to short-lived perennial herb, Hyptis suaveolens is commonly found in disturbed places such as roadsides, field edges, abandoned farmlands, fences, dumps and around homes. Originally native to tropical America, it is now widely established in many tropical regions, including Nigeria.

The plant has an erect, much-branched and somewhat rangy habit. Like other members of the mint family, its stems are characteristically square in cross-section and covered with fine hairs. The leaves are opposite, ovate, toothed along the margins and softly hairy on both surfaces. They give off a strong minty aroma when crushed.

The small flowers, usually lilac to purple, occur in compact clusters in the axils of the leaves. Under favourable conditions, the plant can grow to about 2.5 metres and may become quite abundant because of its ability to reproduce readily from seed.

Though considered a stubborn weed by many farmers, this botanical resource has a long history of traditional use. The leaves and aerial parts have been prepared as infusions and decoctions and have also been used externally in different communities.

Parts used: Leaves, seeds and aerial parts.

The photochemistry of this herb is just as interesting as its aroma. Essential oils containing compounds such as sabinene, 1,8-cineole and beta-caryophyllene have been reported, alongside flavonoids, tannins, phenolic compounds, alkaloids and terpenoids. Recent work on Nigerian material has also isolated several diterpenoids and triterpenoid compounds.

Across different communities, this minty herb has a long record of traditional use. Its leaves and aerial parts have been prepared in infusions, decoctions and topical preparations for a range of everyday complaints.

Traditional applications of the plant are as follows:

Fever and febrile conditions

Traditionally, aromatic preparations of Hyptis sp. Have been used in some communities during episodes of fever and other febrile complaints. The plant has also been investigated experimentally for antipyretic and related activities. These findings are interesting, but for persistent symptoms, proper medical attention is advised.

Catarrh, cough and cold

The strongly aromatic leaves have traditionally been prepared as infusions or other aromatic preparations for cough, catarrh and related respiratory complaints. The essential oil has also demonstrated antimicrobial activity in laboratory studies, providing an interesting chemical dimension to the plant’s traditional reputation.

Stomach discomfort and bloating

Traditionally, Hyptis has been used for stomach ache, colic, flatulence and other digestive complaints. Its aromatic nature and reported antispasmodic activity have attracted scientific interest.

Loss of appetite and nausea

Aromatic and somewhat bitter plants have traditionally been used in many cultures to stimulate appetite and settle digestive discomfort.

Hyptis has been included among plants used traditionally for digestive complaints, although evidence for specific effects on nausea or appetite remains largely based on traditional knowledge and experimental research rather than established clinical treatment.

Mosquitoes and insect bites

The plant has a long history of traditional use around insects, and its aromatic essential oil has attracted scientific attention as a potential insect-repellent. In laboratory research, H. Suaveolens essential oil demonstrated repellent and larvicidal activity against Aedes albopictus.

This takes me back to my grandmother’s house.

Reminiscing about vacations in my hometown as I wrote this article, I remembered my late grandmother placing some minty herbs. I believe they consisted of Hyptis, catnip and basil (nchanwu in Igbo) on our windowsill to repel mosquitoes.

Did it really work?

I can say for certain that we slept better those nights.

Wounds and skin complaints

In traditional practice, crushed leaves and other preparations have been used topically for minor wounds, boils, rashes and other skin complaints. Laboratory studies have also found antimicrobial activity in the plant’s essential oil.

Hyptis suaveolens may be a common roadside weed, but its long history of traditional use and its diverse phytochemistry make it a fascinating example of why ethnobotany deserves attention.

From fever and digestive complaints to respiratory discomfort, skin applications and traditional insect control, different communities have found different uses for this strongly aromatic herb.

Modern research is beginning to examine some of the chemistry behind these traditional applications, but there is still much to learn.

Sometimes, the plant we walk past every day may be carrying a pharmacological story we have barely begun to understand.