Euphorbia mammillarisFrank Vincentz · CC BY-SA 3.0
Succulent

Euphorbia mammillaris

A succulent spurge from the Cape Province of South Africa (Little Karoo, southern Cape), known as the corncob cactus. Its erect, club-shaped stems carry rows of angular tubercles like a corncob – the name mammillaris (“nipple-like”) refers to them. It is not a true cactus; its spines are dried flower stalks. Like all spurges, it contains an irritant milky sap.

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Botanical fact sheet

Euphorbia mammillaris L.

✓ Verified fact sheet Nov 4, 2026
Euphorbia mammillaris
Photo: Frank VincentzCC BY-SA 3.0sourceInfringing image? Let us know
Taxonomy
Family: Euphorbiaceae · Genus: Euphorbia9
Plant type
Succulent shrub.
Native distribution
South Africa, the southern regions of the Cape.11
Natural habitat
Primarily found in subtropical biomes.
Height / growth form
Succulent shrub.
Synonyms
9 synonyms
  • Euphorbia mammillaris
  • Euphorbia enneagona Haw.
  • Euphorbia erosa Willd.
  • Euphorbia latimammillaris Croizat
  • Euphorbia mammillaris Haw.
  • Euphorbia mammillaris spinosior A.Berger
  • Euphorbia mammillaris submammillaris A.Berger
  • Euphorbia platymammillaris Croizat
  • Treisia erosa (Willd.) Haw.
10

Euphorbia mammillaris is a plant species endemic to Cape Province of South Africa. Euphorbia mammillaris, also known as African or Indian corn-cob, is a fast-growing shrublet, with thick stems that are chalky green, erect and ribbed.

Still missing: flowering period, growth & dormancy period.

Sources (15)
  1. Kew – Plants of the World Online – Euphorbia mammillaris
  2. IPNI – Euphorbia mammillaris
  3. Foliage Factory – Euphorbia mammillaris
  4. Foliage Factory – Euphorbia mammillaris
  5. Foliage Factory – Euphorbia mammillaris
  6. Foliage Factory – Euphorbia mammillaris
  7. World of Succulents – Euphorbia mammillaris
  8. World of Succulents – Euphorbia mammillaris
  9. GBIF Backbone Taxonomy – Euphorbia mammillaris · Scientific name · CC BY 4.0
  10. GBIF – synonyms · Synonyms · CC BY 4.0
  11. GBIF – distributions (Integrated Taxonomic Information System (ITIS); Catalogue of Life; The World Checklist of Vascular Plants (WCVP)) · Native distribution · CC BY 4.0
  12. Wikidata – Q4301008 · CC0
  13. Wikimedia Commons – Euphorbia mammillaris - Gaiser Conservatory (Manito Park) - IMG 7010.JPG · Public domain
  14. Wikipedia (de) – Euphorbia mammillaris · CC BY-SA 4.0
  15. Wikipedia (en) – Euphorbia mammillaris · CC BY-SA 4.0
Community knowledge

Tips & experience from members

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Real data

How members water it

Not enough logs yet: at least 3 plants with regular watering logs are needed (now: 0). Waterings logged in Care feed this – anonymised and aggregated.

Care guidelines

How it thrives

Partly general data for the genus Euphorbia
Waterlow
Lightfull sun
Humiditylow
Min. temperature10 °C
Dry winter rest · general genus dataDifficulty: ●●○○○ · general genus data⚠ May be toxic to pets / people

No monthly schedule is shown because cultivar-/species-level data is not yet sufficient. The general values above are guidance only.

Handle with gloves: the white milky sap released when damaged is toxic and irritates skin and eyes.

Cultivars

Cultivars of Euphorbia mammillaris

⚠ Pets & children · genus Euphorbia
Cat moderateDog moderateHorse moderatePet bird moderateRabbit, rodent moderateCattle moderateSheep, goat moderatePig moderatePoultry moderateTortoise, herbivorous reptile moderateHuman (child) moderatedetails →

Latex in the eye can cause serious injury – wear gloves!

At a glance

Euphorbia mammillaris – what to know

Euphorbia mammillaris – family: Euphorbiaceae, genus: Euphorbia. Native range: South Africa, the southern regions of the Cape. Care guidelines: light: full sun; water: low; min. 10 °C. For cats: moderately toxic; for dogs: moderately toxic. Keep it out of reach and call a vet straight away if you suspect poisoning.

Frequently asked questions

How often should I water Euphorbia mammillaris?

Sparingly: let the soil dry out completely between waterings, and water even less in winter.

How much light does Euphorbia mammillaris need?

It needs plenty of direct sun – the sunniest window, or outdoors in summer, suits it best.

How cold can Euphorbia mammillaris get?

Keep it above 10 °C – it is frost-tender and needs a frost-free spot in winter.

Is Euphorbia mammillaris toxic to cats and dogs?

For cats: moderately toxic; for dogs: moderately toxic. Keep it out of reach and call a vet straight away if you suspect poisoning.

When does Euphorbia mammillaris flower?

According to the general guideline for the genus Euphorbia: Typical flowering time: April, May, June, July, August.

Community intelligence

What members’ data shows

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Average watering interval

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Questions about this species

Same genus

Euphorbia

Data sources: GBIF.org – Euphorbia mammillaris (CC BY 4.0) · Wikidata – Q4301008 (CC0) · Wikimedia Commons – Euphorbia mammillaris - Gaiser Conservatory (Manito Park) - IMG 7010.JPG (Public domain) · Wikipedia – Euphorbia mammillaris (CC BY-SA 4.0) · Care data is for guidance only.

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