A signature "medusoid" Euphorbia: thin branches radiate in every direction from a stout central stem. Native to the coastal grasslands of South Africa's Eastern Cape and southern KwaZulu-Natal, it is known in Japan as 孔雀丸 (kujaku-maru, "peacock ball"). With age the base of the stem thickens into a caudex, and the crown grows rugged and characterful around the growing point. In the growing season it produces small yellow-green flowers (cyathia) repeatedly. Tough and beginner-friendly from seed, it is a classic introduction to the octopus-form Euphorbias. The milky sap from a cut is mildly caustic, so handle with light care. POWO gives the accepted name as Euphorbia flanaganii, which this site follows.
Care
Light & Placement
Native to coastal grasslands from the Eastern Cape into southern KwaZulu-Natal, where it sprawls across sandy ground, it likes a bright spot but burns under harsh midsummer sun. Give it full outdoor light in the growing season, with 30–40% shade in peak Japanese summer to prevent scorching of the branches and leaves. The slender branches stretch and thin out easily, so keep light strong enough to avoid etiolation. Ensure good airflow on a raised shelf. For winter dormancy, bring it to a bright indoor window held above 5°C, out of rain, and keep it nearly dry.
Watering
In active growth, water thoroughly once the surface dries, then let it dry well — that rhythm keeps the branches firm. Prolonged rain causes root rot, so shelter under eaves. In dormancy, keep nearly dry, misting once or twice a month.
Substrate
Drainage above all, in an inorganic mix. Small-grain Akadama : Kanuma : pumice = 4:3:3 is a reliable baseline. A pinch of slow-release such as Magamp K helps early growth, and a taller pot improves wet-dry cycling.
Fertilizer & Supplements
A small amount of slow-release in active growth, plus a monthly dilute liquid feed (around twice the label dilution). Overfeeding causes the branches to stretch and invites root rot — feed lightly and let the caudex and branches thicken slowly.
Temperature & Overwintering
Optimal 20–32°C with a 5°C winter floor. Its habitat is frost-free, so it is not especially cold-hardy. Damp soil at low temperatures is the most common failure mode. From autumn, taper water in stages and overwinter fully dry on a bright indoor window, out of rain.
Starting from Seed
Where to source seeds
Pre-sowing treatment
Soak seeds for about half a day in a mix of a registered seed-treatment fungicide (Benlate or Daconil) and a plant tonic (Menedael; outside Japan, SUPERthrive or a chelated iron / seaweed extract works similarly), each diluted per label. Floaters tend to be empty.
Substrate
Use a separate seedling mix that's fine-grained and near-sterile: fine Akadama, fine Kanuma, and vermiculite in equal 1:1:1 parts. Sterilize the mix with boiling water or a quick microwave pass before sowing.
Sowing method
Sow with no covering, or only the thinnest dusting of substrate so the seeds remain partly visible. Space them at least 1 cm apart so they don't clump or overlap on the surface.
Light & temperature
Keep the tray in bright shade at a steady 22–28°C. Expect germination in 7–21 days. Germination depends on seed freshness, but with fresh seed it is reasonably steady.
Watering
Bottom-water with the level 1–2 cm up the pot. For the first 2–3 weeks, prioritize not letting things dry at all, then drop the level in steady stages once the seedlings have come up.
Fertilizer
No feeding right after germination. Once the true leaves emerge, give a heavily diluted liquid fertilizer once or twice a month — go lighter than the label suggests for safety.
From Germination to Repotting
Germination through true leaves
Continue bottom watering and avoid strong light.
Weaning off bottom watering
Wean off gradually over 1–2 months.
First repotting
In year 1 or 2, once the plant becomes root-bound.
Common Pitfalls
Mold & damping-off
- Cause: Excess moisture, contamination
- Prevention: Sterilize substrate, ensure ventilation
Etiolation
- Cause: Insufficient light
- Prevention: Move the LED closer right after germination, or move outdoors to bright shade
Seeds fail to germinate
- Cause: Stale seeds, insufficient temperature
- Prevention: Use fresh seeds and a heat mat
Notes
The latex can irritate if it gets on skin or mucous membranes — take care with hands and eyes.
