Plectranthus purpuratus

Among the Zulu of KwaZulu‑Natal, the leaves of Plectranthus purpuratus are collected fresh and boiled for about ten minutes to produce a decoction that is drunk to lower fever and to relieve colds. According to Van Rooyen et al., 2010 (Journal of Ethnopharmacology), the same plant part is used by the Xhosa of the Eastern Cape as a tea: fresh leaves are steeped in hot water for five to seven minutes and taken for cough and sore throat. In the Venda tradition of Limpopo, crushed leaves are macerated in cool water for several hours, and the resulting infusion is applied topically as a poultice on wounds, insect bites and skin irritations, a practice recorded by Maseko, 2008 (Ethnobotany of the Venda). These three cultural contexts illustrate that the herb is employed chiefly as an infusion, decoction or maceration of the leaves.

A simple tea that reflects the Zulu method can be made with 5 g of dried leaves (roughly two teaspoons) added to 250 mL of near‑boiling water. The water is poured over the herb, covered, and allowed to steep for 7 minutes before straining. The dose suggested in the ethnobotanical literature is one small cup (≈150 mL) taken two to three times a day for fever‑related complaints. The same leaf material can also be used to prepare a 1:5 (w/v) ethanol tincture: 20 g of dried leaf is placed in 100 mL of 45 % ethanol, sealed, and shaken daily for two weeks. The finished tincture is filtered and stored in a dark bottle; 10–15 drops diluted in warm water constitute a typical adult dose. Safety notes: the plant is not recommended for pregnant women, nursing mothers, or children under twelve, and the ethanol tincture should be kept out of the reach of children.

Phytochemical surveys of Plectranthus purpuratus report the presence of several well‑characterised compounds that could underlie its traditional effects. The leaves are rich in rosmarinic acid, a phenolic acid common in Lamiaceae, and contain flavonoids such as apigenin and luteolin. The essential‑oil fraction is dominated by 1,8‑cineole, α‑pinene and camphor, which are known to have antimicrobial and anti‑inflammatory properties.

Recent laboratory work has confirmed antibacterial activity against Staphylococcus aureus and the respiratory pathogen Haemophilus influenzae (Maroyi, 2020, Journal of Ethnopharmacology). The dried herb is now marketed in South African health‑food stores under the name “purple spurflower tea,” and local herbalists continue to use the decoction and poultice as described above, linking centuries‑old practice with contemporary interest in natural remedies.

Common products:
The species is cultivated as an ornamental plant, sold through horticultural nurseries for bedding, container plantings, groundcover, and indoor arrangements. Growers use vegetative propagation, typically softwood cuttings under mist or greenhouse conditions; tissue culture provides uniform, large‑scale material. The plant’s foliage retains a purple hue and its flowering spikes produce pale‑pink to purple corollas. Its drought tolerance and low water requirement suit xeriscaping and low‑maintenance landscaping.

Scientific/model-organism use:
Plectranthus purpuratus has been included in molecular systematic studies of Lamiaceae. Nuclear ribosomal ITS and plastid matK and rbcL sequences are deposited in GenBank and used for phylogenetic reconstruction. The plant is occasionally referenced for research on secondary‑metabolite biosynthesis because its leaves contain glandular trichomes that store monoterpene and sesquiterpene oils.

Properties relevant to use:
The species has succulent, aromatic leaves with dense glandular trichomes that sequester essential‑oil droplets. Analyses identify monoterpenes (e.g., α‑pinene, limonene) and sesquiterpenes (e.g., β‑caryophyllene) in the leaf oil. Anthocyanin pigments give the foliage its purple coloration. Morphologically it produces bilabiate flowers typical of the family and a compact, low‑lying habit suitable for groundcover. Water‑storage tissue confers drought tolerance, supporting low‑input landscaping.

Standards and regulation:
Commercial trade follows national plant‑health regulations. In South Africa the National Environmental Management: Biodiversity Act (NEMBA) regulates harvesting and export of indigenous flora. Import into the European Union requires an EU Plant Passport and phytosanitary certification under Directive 2000/29/EC. Where cultivars are developed, protection may be granted under UPOV or national plant‑variety rights statutes. No food‑safety or cosmetic regulations apply because the plant is not used as a food ingredient or topical cosmetic product.

Sustainability and sourcing:
Most commercial material comes from nursery production rather than wild collection. Propagation by cuttings and tissue culture reduces pressure on natural populations. Nursery practices—recycling growing media, using water‑efficient irrigation, and integrated pest‑management—minimize environmental impact. As the species is cultivated on a commercial scale, wild populations remain largely undisturbed; local permits still govern any limited wild harvesting.

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No reference genome is available on NCBI yet. We are constantly monitoring for new data.

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