Mammillaria geminispina

A clumping, white-spined Mammillaria from central Mexico (Hidalgo, Querétaro, San Luis Potosí), holder of the RHS Award of Garden Merit. It grows on dry slopes between about 500 and 2,400 m; give it full sun, a gritty mix, summer water and a cool, dry winter.

At home, aim for

Day Cool-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 slopes and rocky ground in the scrub of central Mexico, often forming large mounds; the habitat detail is generalised from the region.

Recorded elevations 483–2,422 m, median 1,255 m (103 records).

HidalgoQuerétaroSan Luis PotosíMexico

🔒 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 3.0 licence, unmodified.