Euphorbia mammillaris

Euphorbia mammillaris, the corncob euphorbia, is a clumping, many-angled stem succulent from the southern Cape, with tessellated ribs and spines left by old flower stalks. It grows in bright, dry scrub with mild coastal temperatures, so it wants strong light, a free-draining mineral mix and a cooler, drier winter.

At home, aim for

Day IntermediateTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Bright, filtered lightDLI and PPFD in Plantistry

Expects a seasonal restGrows in the ground

Where it grows wild

Low stem succulent of karroid scrub and succulent thicket on stony slopes and flats, often growing among and partly sheltered by shrubs.

Mostly near sea level to about 400 m in the recorded sites; few records carry an elevation.

Western CapeEastern CapeSouth Africa

🔒 Growing it like that

The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:

✓ Day and night temperature targets, and the limits it tolerates

✓ Humidity band, and how to hold it

✓ Light as DLI and PPFD for a grow light

✓ Wet and dry seasons, and whether to rest it

✓ Substrate and airflow

✓ A step-by-step setup to grow it like the wild

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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its Public domain licence, unmodified.