Euphorbia polygona

A many-angled, spiny columnar Euphorbia of the Eastern Cape, recorded mostly between the Gamtoos and Great Fish rivers. It grows in sunny succulent thicket and karroid scrub with light rain spread through the year and a cooler, drier winter, so it wants strong light, fast drainage and a cool, dry rest.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Full sunDLI and PPFD in Plantistry

Expects a seasonal restGrows in the ground

Where it grows wild

Grows among rocks and in open patches of succulent thicket and dwarf karroid scrub on stony slopes, rooted in shallow, gritty soil.

Few records carry an elevation; the weighted climate sites sit at about 130–1,200 m, mostly low hills near the coast.

Cape Provinces

🔒 Growing it like that

The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:

✓ Day and night temperature targets, and the limits it tolerates

✓ Humidity band, and how to hold it

✓ Light as DLI and PPFD for a grow light

✓ Wet and dry seasons, and whether to rest it

✓ Substrate and airflow

✓ A step-by-step setup to grow it like the wild

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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its Public domain licence, unmodified.