Melocactus macracanthos

A Turk's-cap cactus of the ABC islands (Aruba, Bonaire, Curaçao), growing in full sun on coral limestone and rocky coastal scrub just above sea level. It needs constant warmth, strong light and a gritty mineral mix, and once it forms its woolly cephalium it stops growing taller, so keep it alive and warm rather than pushing growth.

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 in the ground

Where it grows wild

Dry coastal thorn scrub and open rocky ground on limestone and volcanic rock, exposed to steady trade winds and salt air. Typical of lowland Caribbean Melocactus, it grows among low shrubs and rocks with little or no shade.

Lowland, from near sea level to roughly 100–200 m on the islands' hills; few GBIF records carry an elevation.

ArubaCuraçaoBonaire

🔒 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.