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Species library › Mammillaria › Mammillaria hahniana
Succulents Well documented

Mammillaria hahniana

The old lady cactus is a white-haired, clustering Mammillaria from the semi-desert of central Mexico, centred on Querétaro and nearby states. It wants bright sun, warm summers with modest rain, and a cool, completely dry winter.

Mammillaria hahniana
Photo: Peter A. Mansfeld, CC BY 3.0, via Wikimedia Commons
At home, aim for
Day Cool-growingTargets in Plantistry
Night A clear drop at nightTargets in Plantistry
Humidity Dry airBand in Plantistry
Light Bright, filtered lightDLI and PPFD in Plantistry
Expects a seasonal restGrows in the ground

Where it grows wild

Semi-desert scrub on rocky slopes, often nestled among shrubs and grasses for partial shelter.

Recorded at 592–2240 m, median 1553 m.

QuerétaroGuanajuatoHidalgoTamaulipas

🔒 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

Grow Mammillaria hahniana? Add it to a free garden and its full profile opens. Pro opens all 38,374 profiles in the library, plants and fungi.

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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.