Melocactus ernestii

A Turk's cap cactus of the Brazilian caatinga that grows on sun-baked granite and gneiss outcrops in north-eastern Brazil. It wants heat all year, intense light, and never cold, wet roots.

At home, aim for

Day Warm-growingTargets in Plantistry

Night A clear drop at nightTargets 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

Rock crevices and thin soil pockets on inselbergs and outcrops within dry caatinga scrub. These notes rely on the measured sites and the well-known habits of rock-dwelling Melocactus.

Recorded from near sea level to about 1,200 m, mostly around 600 m.

Brazil NortheastBrazil Southeast

🔒 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.