Pelargonium sidoides Seeds | Umckaloabo
.jpg "Umckaloabo (Pelargonium sidoides) seed")
LATIN NAME: Pelargonium sidoides
COMMON NAME: Umckaloabo
Plant Profile
The story the trade still tells is that in the late nineteenth century an Englishman known as Charles Stevens, told he was dying of consumption, travelled to southern Africa and came home cured, carrying the root remedy that had treated him. European doctors argued over ‘Steven’s cure’ for years, the Zulu name umckaloabo stuck to the plant, and today a standardised root extract of Pelargonium sidoides is among the most researched herbal products in European pharmacies. Underneath the legend sits a modest, grey-leaved perennial from the high grasslands, blooming almost black.
The plant forms a low mound of heart-shaped, velvety, silver-grey leaves on reddish stalks, and from spring onward sends up slender stems carrying small, five-petalled flowers of a wine-red so dark they read black in most light. Brush the foliage and it breathes a soft, herbal scent — pleasant, but nothing like the rose or lemon of the scented pelargoniums. A thick, tuberous rootstock sits below, and that is the part the medicine trade digs.
The species name means ‘Sida-like’, a nod to the mallow foliage it resembles; the genus is Pelargonium, not the hardy Geranium clan, and the distinction matters at the seed counter. Its closest working relative is Pelargonium reniforme, a pink-flowered cousin from the same hills that shares the root tradition; the two are collected side by side but often sell under one name.
The shift matters to growers: cultivated root is now the trade’s preference, harvested from plants raised for two or three seasons until the tuber fills, lifted in the dry season, washed and shade-dried. Field practice favours light, stony, free-draining ground where the root runs deep and clean — the same conditions the species chose for itself on the highveld.
Science & Biotechnology
Root chemistry centres on coumarins — umckalin is the named marker — alongside phenolic acids and flavonoids. A standardised aqueous-ethanol root extract has been through controlled clinical programmes, particularly against acute bronchitis, and the regulatory story is unusually well documented for a herbal product. Wild stock cannot supply that industry, which is why commercial fields in southern Africa now grow the species under contract, and why over-collection of wild plants in Lesotho and the Eastern Cape has become a conservation talking point.
Uses & Benefits
In the ornamental garden it earns its place on dry banks, rockeries and container groups, where the grey foliage sets off almost anything and the dark flowers hold their own against silver companions. It is drought-happy once established, shrugging at dry spells that collapse soft perennials, and it keeps flowering through the season’s worst heat.
Pots suit the species almost better than beds: the rootstock likes a warm root run, the mound spills neatly over the rim, and the whole plant can be wheeled under cover before the first frost. A wide, shallow container in a gritty loam-based mix with added pumice does the job; keep the collar of the rootstock at or just above the surface so winter wet never sits against the crown. Water only when the pot has dried through, feed sparingly — a hungry plant blooms darker — and shear lightly after the first main flush to pull the mound back into shape for a second round of flowers.
Within southern African household practice the root has long been prepared as a decoction and applied as a wound wash, with the dried root traded informally between neighbours long before any European pharmacy heard the name. Ethnobotanists recording that practice note how precisely collectors distinguish the two used species by leaf shape and flower tone — knowledge built on generations of digging the same hillsides. The lesson for a modern grower is respectful and practical: the plant’s value was carried by local knowledge first, and the cultivated root trade now standing on it has an obligation to keep wild populations standing too.
Growing from Seed
Seed is fine and likes warmth: sow on the surface of a gritty, free-draining mix, press in without burying, and keep just moist under bright light. Prick out at the two-true-leaf stage into individual cells, and grow the young plants on the dry side of the bench — they resent wet feet far earlier than they resent drought. Take cuttings from firm young shoots if you need clones of a good plant.
Frost-tender in most of the temperate world, the plant overwinters dry and cool where winters freeze — tubers lifted like dahlias, or pots brought under cover; in mild districts a gravel mulch and sharp drainage see it through. Crowns divide cleanly at the tuber, and a divided plant jumps away faster than a seedling.
Our Take
Grow it as much for the grey-and-black contrast as for the root — few perennials hold a dry bed so calmly. Its geranium-family neighbours make a good trio on the same bench: rose geranium (Pelargonium graveolens) for scent, zonal geranium seed for colour, and, on the remedy side of the fence, English thyme as the temperate-climate chest herb. Give it grit, sun and a dry winter, and it will give you the darkest flowers in the bed.
Related Reading
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