Mammillaria boelderliana
A small, rarely recorded Mammillaria from northeastern Mexico, with a single wild record in GBIF. Grow it like other Chihuahuan Desert mammillarias: full sun, very free-draining mineral soil, summer water and a cold, dry winter.
Where it grows wild
Probably rocky, often limestone, slopes in Chihuahuan Desert scrub, inferred from related small mammillarias of Coahuila and Nuevo LeΓ³n; nothing specific to this species was found.
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-SA 3.0 licence, unmodified.