Gymnocalycium ragonesei

A tiny, flattened Gymnocalycium (up to 5 cm) with hair-thin white spines and white flowers, from the saline flats of the Salinas Grandes in Catamarca and Córdoba, Argentina. It grows semi-buried at the edge of saline grassland, in hot summers and cold, dry winters, at 100–500 m.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets 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

Grows half-buried in the ground at the margins of saline grassland around the Salinas Grandes, alongside Gymnocalycium schickendantzii, G. bodenbenderianum and Setiechinopsis mirabilis. Surrounding grasses and shrubs give some shade.

Found at 100–500 m.

CatamarcaCórdoba

🔒 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.