Mammillaria glassii

A small clustering Mammillaria from the high limestone mountains of northeastern Mexico, hidden under dense white hair-like bristles. It grows on steep rock, often in part or full shade, and takes hard frost when dry; give it bright but not baking light, sharp drainage and a cold dry winter.

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 on steeply sloping rock, often in shade and even full shade, in the Sierra Madre Oriental.

Recorded at 1400–3511 m, median 2479 m; subsp. glassii at about 1450–2250 m, subsp. ascensionis at 2400–2750 m.

Nuevo LeónCoahuilaTamaulipas

🔒 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.