Gymnocalycium glaucum

A blue-grey, strongly spined Gymnocalycium described by Ritter from Catamarca in northwest Argentina. It comes from hot, sunny scrub with summer rain and a dry, cool winter, and grows best with strong light, a mineral mix and a dry winter rest.

At home, aim for

Day IntermediateTargets 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

Dry scrub and rocky slopes of the Monte region in Catamarca, typically among stones and at the edge of shrubs. Little is published on its microhabitat; this is built from the measured climate and the genus.

Few records carry an elevation; the climate sites sit around 700–1100 m.

Catamarca

🔒 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 CC0 licence, unmodified.