Melocactus mazelianus

A small Turk's-cap cactus from the hot granite outcrops of the middle Orinoco on the Colombia–Venezuela border. It needs heat all year, strong light and a fast-draining mineral mix, with a drier spell in the northern-hemisphere winter months that match its local dry season.

At home, aim for

Day Warm-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 on rock (lithophyte)

Where it grows wild

Grows in thin pockets of sand and gravel on exposed granite outcrops and savanna rocks in the Orinoco lowlands, in full sun with heavy wet-season rains.

The recorded sites lie at about 70–135 m, in hot lowland.

ColombiaVenezuela

🔒 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 4.0 licence, unmodified.