Euphorbia avasmontana: Sculptural Spines from Southern Africa
Euphorbia avasmontana – A Bold Addition for Xerophyte Lovers
Euphorbia avasmontana, also called the Slender Candelabra Euphorbia, is a striking succulent from the arid highlands of Namibia and South Africa. With upright, grey-green stems lined with paired spines and narrow ridges, it resembles a cactus but belongs to the Euphorbiaceae family. Like all Euphorbias, it contains a milky, toxic sap and thrives in full sun with minimal watering.
Visual Highlights of Euphorbia avasmontana
- Growth Form: Clump-forming, columnar succulent with multiple stems, reaching up to 2.5 m tall and 6–7 cm thick.
- Ribbed Stems: Usually 5 to 6 shallow ribs, each edged with spines linked by raised, horny margins.
- Spines: Sharp, paired spines up to 2 cm long, offering striking geometric texture.
- Flowers (Cyathia): Small, yellow, sessile blooms forming at the top of mature stems in cymes; mainly seen in spring and autumn.
Where Euphorbia avasmontana Grows in the Wild
This succulent originates from rocky slopes and dry hills along the Orange River valley, crossing parts of southern Namibia and northern South Africa (especially Namaqualand and Bushmanland). It thrives in succulent karoo ecosystems with sparse rainfall (150–300 mm annually), often alongside Aloe dichotoma, thriving at elevations from 400 to 1200 m.
Care Tips for Euphorbia avasmontana Indoors
Light
- Needs bright, direct light for most of the day — ideally at least 6–8 hours.
- Can tolerate light shade but will stretch and weaken without strong sun.
Watering
- Only water when the substrate is completely dry — typically every few weeks indoors.
- Lower temperatures or weak light = slower drying. Adjust accordingly.
Humidity
- Prefers dry indoor air. No added humidity needed — avoid overly damp spaces.
Temperature
- Ideal range: 18–30°C. Protect from prolonged exposure below 10°C.
Soil
- Use a gritty, mineral-rich cactus mix with excellent drainage.
- pH between 6.0 and 7.5 works best.
Potting and Containers
- Choose pots with large drainage holes.
- Repot every 2–3 years or when roots crowd the base.
Feeding
- Fertilize monthly with a diluted cactus fertilizer during active growth — no seasonal restriction needed if conditions are stable.
Propagation
- Propagate by cutting a healthy stem and letting it callous for 1–2 days.
- Always wear gloves — the sap is irritating and toxic.
Pruning
- Trim back damaged stems using sterile tools and gloves.
Typical Problems with Euphorbia avasmontana
Mealybugs and Spider Mites
- Watch for white fluff or webbing, especially at growth tips.
- Use insecticidal soap or beneficial predators.
Root Rot
- Caused by soggy soil. Let the substrate fully dry between waterings.
Sun Stress or Scorch
- Sudden exposure to strong sunlight may cause browning — acclimate gradually.
Other Noteworthy Details on Euphorbia avasmontana
This species is excellent for collectors interested in xerophytes, caudiciforms, or spiny succulents. Its architectural form pairs well with mineral decor or bonsai-style displays, and it fits perfectly in dry indoor spaces or heated greenhouses.
Origin of the Name Euphorbia avasmontana
- Euphorbia honors Greek physician Euphorbus, who used related plants medicinally.
- avasmontana refers to Namibia’s Awas Mountains, where this species was first collected.
- Described by Moritz Kurt Dinter in 1928, a leading botanist in southern Africa.
FAQs About Euphorbia avasmontana
Is Euphorbia avasmontana poisonous?
Yes. The white sap is highly irritating and toxic if ingested. Keep away from pets and children.
Does Euphorbia avasmontana flower often indoors?
Rarely. It needs full sun and maturity to bloom. Flowers are small and ornamental rather than showy.
Can I keep Euphorbia avasmontana outside?
Yes — in frost-free areas with excellent drainage and full sun exposure.
Add Euphorbia avasmontana to Your Succulent Collection
Its bold form, low-maintenance needs, and desert origin make Euphorbia avasmontana a standout piece for bright indoor corners or sunny patios. Order now and bring home a rare gem from the African highlands.
Euphorbia avasmontana
Euphorbia avasmontana is approximately 55 cm tall and comes in a ⌀ 27 cm pot
