Coryphantha poselgeriana

A large, usually solitary, blue-grey globular cactus with big angular tubercles and showy pink to magenta flowers, from the Chihuahuan Desert of northern Mexico. It wants full sun, a warm summer with moderate water, and a cold, completely dry winter rest.

At home, aim for

Day IntermediateTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Full sunDLI and PPFD in Plantistry

Expects a seasonal restGrows in the ground

Where it grows wild

Open desert scrub and gravel or limestone flats and slopes in the Chihuahuan Desert, at 740 to 2,300 m (median about 1,500 m). It often grows in the open or at the edge of shrubs.

Eighty-one records give 739 to 2,298 m, with a median of 1,485 m.

CoahuilaDurangoMexico Northeast

🔒 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 4.0 licence, unmodified.