Mammillaria carretii

A small, solitary to clustering hooked-spined Mammillaria from the mountains of Coahuila and Nuevo León, growing in rock crevices often among moss. It handles cold, dry winters well and benefits from a cool, dry rest to flower.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Bright, filtered lightDLI and PPFD in Plantistry

Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

Grows in crevices and pockets of humus on limestone rocks and cliffs in montane scrub and oak or pine-oak woodland, often partly shaded.

Mountains of northeastern Mexico; the single measured site is at 1,333 m.

Mexico NortheastCoahuilaNuevo León

🔒 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.