Mammillaria mammillaris

The woolly nipple cactus of the southern Caribbean and northern Venezuela and Colombia, forming solitary or small groups of globular stems up to about 20 cm across. It is a frost-tender lowland cactus of hot, dry coastal scrub that needs warmth all year and strong sun.

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

It grows in coastal and mountainous dry scrub on rocky ground, according to Wikipedia; the open, rocky microhabitat is drier than the regional grid suggests.

Wikipedia gives 0–500 m; the records span 5–1677 m with a median of 500 m.

VenezuelaColombiaCuraçaoArubaBonaireTrinidad and TobagoWindward Islands

🔒 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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More Mammillaria

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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 2.0 licence, unmodified.