Mammillaria microhelia

A small, columnar Mammillaria from the highlands of Querétaro and nearby north-east Mexico, densely covered in fine, often golden radial spines. It needs bright light, a mineral mix, a summer-wet and winter-dry rhythm and cool winter nights.

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

Rocky slopes and outcrops in highland scrub and open oak–pine woodland, rooted in crevices and shallow soil among rocks.

Recorded at 871–2,873 m, median 2,328 m (7 records); most sites lie above 2,300 m.

Mexico

🔒 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-SA 3.0 de licence, unmodified.