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Species library › Gymnocalycium › Gymnocalycium castellanosii
Succulents Well documented

Gymnocalycium castellanosii

A solitary, blue-green globular cactus from rocky slopes and red sandstone hills of La Rioja, Córdoba and San Juan in Argentina. It expects hot wet summers and a dry, cool winter rest.

Gymnocalycium castellanosii
Photo: Reinhart Schade, CC BY-SA 3.0, via Wikimedia Commons
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

Rocky slopes and red sandstone mountains in semi-arid shrubland, alongside Gymnocalycium saglionis, Echinopsis aurea and Stetsonia coryne.

Recorded at 500 to 1500 m; measured sites lie between about 260 m and 860 m.

La RiojaCórdobaSan Juan

🔒 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 licence, unmodified.