Gymnocalycium uebelmannianum

A small grey-green chin cactus with chalky, twisted spines and white flowers with a pink throat, endemic to the Sierra de Velasco in La Rioja, Argentina, at 2200–2800 m. It is a cool mountain plant: bright light, a dry, cold winter and a gritty mineral mix.

At home, aim for

Day Cool-growingTargets in Plantistry

Night A clear drop at nightTargets 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

Rocky high slopes of the Sierra de Velasco, among stones and sparse grass and shrubs; it starts solitary and later clusters.

Literature gives 2200–2800 m; the single climate site is a lowland grid point and runs far too warm.

La Rioja (Argentina)

🔒 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 4.0 licence, unmodified.