Mammillaria humboldtii

A small, densely white-spined Mammillaria from the dry limestone canyons of Hidalgo, Mexico, around the Barranca de Metztitlán. It wants strong sun, a very mineral mix and a cool dry winter.

At home, aim for

Day Cool-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

Rocky limestone slopes and cliff crevices in arid scrub, where plants sit among stones in full or slightly broken sun; drawn from general accounts of the species and genus rather than detailed field data.

The single measured site is at about 1,340 m in the Metztitlán canyon area.

MexicoHidalgo

🔒 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 4.0 licence, unmodified.