Euphorbia neohumbertii

A spiny, angular-stemmed succulent shrub from northern Madagascar, best known from the limestone karst of the Ankarana and Antsiranana area. It keeps leaves in the wet season and drops most of them in the cooler, drier months, so a bright, warm spot with a drier winter rest suits it best.

At home, aim for

Day IntermediateTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Bright, filtered lightDLI and PPFD in Plantistry

Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

Grows among exposed limestone rock and in dry deciduous scrub and forest edges in northern Madagascar, often rooted in pockets of grit and leaf debris on karst.

Recorded at 150–860 m, median 390 m; most records come from the northern limestone massifs.

Madagascar

🔒 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 CC BY-SA 3.0 licence, unmodified.