General Plant Information (Edit)
Plant Habit: Cactus/Succulent
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Dry Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 9a -6.7 °C (20 °F) to -3.9 °C (25 °F)
Plant Height: 6 inches or more
Plant Spread: Up to 20 inches
Fruit: Pops open explosively when ripe
Flowers: Other: In the genus Euphorbia, the flowers are reduced in size and aggregated into a cluster of flowers called a cyathium (plural cyathia). This feature is present in every species of the genus Euphorbia but nowhere else in the plant kingdom.
Flower Color: Green
Red
Bloom Size: Under 1"
Flower Time: Spring
Summer
Suitable Locations: Xeriscapic
Dynamic Accumulator: B (Boron)
Resistances: Drought tolerant
Toxicity: Other: All members of the genus Euphorbia produce a milky sap called latex that is toxic and can range from a mild irritant to very poisonous.
Propagation: Other methods: Cuttings: Stem
Offsets
Containers: Suitable in 3 gallon or larger
Needs excellent drainage in pots
Miscellaneous: Tolerates poor soil
With thorns/spines/prickles/teeth

Image
Common names
  • Euphorbia

Comments:
  • Posted by Baja_Costero (Baja California - Zone 11b) on Mar 14, 2022 10:31 PM concerning plant:
    South African cactiform Euphorbia with stems to about 2 inches in diameter, branching at the base and above to form irregular clumps (not pretty mounds) to about 20 inches wide and 6 inches tall. The stems are studded with long spines, which are really modified peduncles, as found on other plants in this group, and presumably these spines inspired the fierce epithet. 9-12 ribs, green to dark red cyathia, separate male and female individuals.

    This spiny stem succulent is reasonably common and well behaved in cultivation. It can be distinguished from two related Euphorbias based on the shape of its clumps (not regular, not smoothly rounded) and sometimes the number of ribs (aggregata has 8-9, pulvinata has 7-10). Like all plants in this group it demands strong light for the best (most compact) form. It is typically propagated from cuttings.

    Two separate individuals (male and female) are required to produce seed, and hybrid offspring may be produced by female plants flowering close to other succulent Euphorbia species. These hybrids (especially with mammillaris group members) tend to be difficult to resolve from the parent species.

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