Mammillaria wagneriana
A solitary or sparsely clustering Mammillaria from the high plateau of central Mexico, typically in grassland and scrub between about 1,400 and 2,600 m. It wants very bright light, a dry winter with cold nights, and summer water.
Where it grows wild
High-plateau grassland and open scrub on rocky or volcanic soils.
Recorded 1,420–2,603 m, median about 1,870 m.
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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.