Euphorbia mammillaris Corn on the Cob Cactus
Product details
| Management number | 250425540 | Release Date | 2026/09/17 | List Price | US$3.20 | Model Number | 250425540 | ||
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- Description
- Euphorbia mammillaris Corn on the Cob Cactus Care Guide
- FAQ/Common Issues
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Euphorbia mammillaris, also called Corn On The Cob Cactus, is a succulent native to the Eastern Cape of South Africa, where it grows among rocky, arid terrain under intense sun. Part of the enormous Euphorbia genus, this drought-tolerant euphorbia has earned a loyal following for its unmistakable sculptural form and forgiving nature.
The plant gets its common name from its ridged, segmented green stems covered in neat rows of tubercles that resemble corn cobs. It grows in an upright, clustering habit, sending up multiple columnar stems that slowly form a dense clump. It stays compact and tidy across all sizes.
Small, inconspicuous flowers appear at the tips of mature stems in spring and summer. The plant also releases oxygen at night, making it a functional addition to bedrooms or living spaces.
Euphorbia mammillaris grows well on sunny windowsills, outdoor summer displays, and xeriscape-style container gardens. You can leave it up to ten days without water. Because the milky sap can irritate skin and paws, keep it on a high shelf out of reach of pets and small children. Starting from small sizes, it slowly develops into an impressive specimen over time.
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Euphorbia mammillaris Corn on the Cob Cactus grows well in partial sun, full sun, or direct sun, though it may scorch in intense south-facing windows during peak summer.
Water it deeply every 2 to 3 weeks in summer and cut back to once a month or less in winter.
Euphorbia mammillaris does best in a fast-draining cactus and succulent mix blended with extra perlite or coarse grit.
It prefers temperatures between 50 and 95°F and should be brought indoors before frost threatens.
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Euphorbia mammillaris is a slow to moderate grower that benefits from a diluted balanced succulent fertilizer once or twice during active growing season.
It is hardy in USDA Zones 9 to 11, tolerating brief dips to around 25 to 28°F but performing best with frost protection. It grows outdoors year-round across Florida, California, Texas, Arizona, Hawaii, Louisiana, Georgia, South Carolina, Alabama, Mississippi, Nevada, and coastal Oregon. Parts of New Mexico, Arkansas, and the warmer corridors of North Carolina and Virginia may also support it through mild winters with minimal shelter.
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Q: How often should I water Euphorbia mammillaris Corn on the Cob Cactus?
A: Let the soil dry out completely between waterings to prevent rot. Soil moisture matters more than a fixed schedule; check the soil before watering in cooler months when growth slows.
Q: Is the sap toxic to pets?
A: Euphorbia mammillaris Corn on the Cob Cactus has milky sap that irritates skin and paws on contact, so keep it on a high shelf away from cats, dogs, and small children.
Q: Does Euphorbia mammillaris need direct sun?
A: It loves bright direct sun and does best in a south or west-facing window or outdoors in full sun during warmer months. Deep shade will weaken the stems over time.
Q: Can I move it outside for summer?
A: Euphorbia mammillaris thrives outdoors in summer sun but needs shelter from rain to prevent waterlogged soil. Acclimate it gradually to direct outdoor light to avoid stress.
Q: How big does Corn On The Cob Cactus get?
A: Individual stems typically reach 6 to 12 inches tall, and the clustering habit means it slowly widens into a full, multi-stemmed clump over time. Both 2" and 4" starting sizes develop into impressive specimens with patience.
Q: Is it beginner friendly?
A: Corn On The Cob Cactus tolerates neglect and irregular watering better than many houseplants. Its compact form also fits small spaces and tight shelves without sprawling.
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Succulent
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