Moroccan Mound
Latin Name: Euphorbia resinifera
$24.95
- Hardiness Zone: Zone 9, Zone 10, Zone 11
- Pot Size: 6 Inch
Euphorbia resinifera grows as a low, dome-shaped mound of upright succulent stems. Each stem is four-sided, pale green to blue-green, and lined with pairs of short brown spines along its ridges. Over the years, the plant sends up new stems from the base, until a single specimen becomes a broad cushion of green columns. It comes from the Atlas Mountains of Morocco, and it resembles a cactus closely enough that many gardeners mistake it for one. That likeness is not a family connection. It is the result of two unrelated plant groups solving the same problem of heat, sun, and long dry spells.
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Plant Details
Quick Information
- Latin Name: Euphorbia resinifera
- Plant Family: Euphorbiaceae
- Common Names: Moroccan mound, resin spurge, African spurge, Euphorbium
- Origin / Native Range: High and Middle Atlas Mountains of Morocco
- Mature Height × Width: 1–2 ft × 4–6 ft
- Exposure Requirements: Full Sun
- Irrigation Requirements: Very Low
- USDA Hardiness Zones: 9–11
- Cold Hardiness: 20°F–25°F (when dry)
- Bloom Time: Late Winter through Spring
- Bloom Color: Yellow
General Information
A young plant may hold only a few stems, and it takes patience to see the finished shape. Growth is slow, and the mound widens a little each season as fresh stems push up around the base. The stems are the working parts of this plant. Leaves are tiny and drop away early, so the thick green tissue handles both food production and water storage. The small spines sit in pairs along the ridges, and they harden from gray to brown with age. In late winter and spring, bright yellow flower clusters open along the upper ridges. Each cluster is a cyathium, meaning a cup of fused bracts that holds several tiny male flowers and one female flower. It reads as a single small bloom, but it is really a whole group packed together.
In Morocco, this species covers rocky, limestone-rich slopes between roughly 3,300 and 6,500 feet. Rain there arrives in winter and spring, and summers are long, hot, and dry. In some places, the plant forms nearly solid stands across a hillside. That habitat explains most of its garden behavior. It wants sharp drainage and gritty or sandy soil, and it resents water sitting around its base during warm weather. Cold by itself is not the main risk. Cold combined with wet soil is what rots the stems, which is why the hardiness figures above assume dry roots through winter. Given full sun and a well-drained slope or raised bed, it works as a low groundcover, a rock garden plant, or a container specimen. Moroccan beekeepers value the flowers as a nectar source, and the species is documented as a honey plant in its native range.
The name resinifera means "resin-bearing", and it points to the milky latex inside every stem. Dried and collected, that latex has been traded as euphorbium since ancient times and used in traditional medicine. Modern chemists isolated its active compound, resiniferatoxin, which is closely related to the capsaicin in chile peppers but far stronger. Researchers have studied it since the 1990s as a possible treatment for severe pain. A caution follows from that chemistry. The latex is a powerful irritant to skin and eyes, and all parts of the plant are toxic if eaten. Wear gloves and eye protection when cutting or moving it, wash any sap off promptly, and site it away from walkways, pet areas, and places where children play.
General Planting & Cultivation Information
Even drought-tolerant plants require regular watering until they are well established, good drainage is essential. If planting in containers, avoid pots without drainage holes.
Irrigate by watering deeply and then allowing the top several inches of soil to dry between waterings. This encourages the plant to send roots deep into the earth in search of moisture, helping it to become established, prevent root rot, build drought tolerance, and resilience to wind, heat, and cold.
The length of time between waterings will vary depending on your growing conditions and environment. Use a moisture meter for precise irrigation.
When planting, set the plant at the same depth as it was in its current container. For trees, ensure the top of the root flare is at soil level.
Young plants are vulnerable to harsh conditions, so consider growing them in larger containers until mature.
When planting in the ground, research the optimal planting season for your climate zone and protect young plants from frost.
To support establishment, consider creating a microclimate with nurse plants, shade, or wind protection. This can reduce stress, conserve soil moisture, and increase long-term success.
Protect the small, immature plants from rabbits and deer.
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