Mammillaria chionocephala
A white-woolly Mammillaria of the Chihuahuan Desert in northern Mexico, treated by some as a subspecies of Mammillaria formosa. It wants full sun, summer warmth with modest summer rain, and a cool, dry winter.
Where it grows wild
Generalised from the genus and region: desert scrub on stony limestone slopes, partly sheltered by shrubs.
Only one record, at about 790 m in Coahuila.
π Growing it like that
The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:
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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 2.0 licence, unmodified.