Gymnocalycium bayrianum

A flattened, blue-green to reddish globular cactus with a few stout, recurved spines and creamy white flowers, from the mountains of Tucumán and Salta. It wants strong light, a warm wet summer and a cold, completely dry winter.

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

Mountain slopes among rocks and grasses at 1,000 to 1,500 m; the taproot sits in mineral soil. Partial cover from grasses is typical of the genus.

Literature gives 1,000 to 1,500 m; the measured sites are at about 1,465 and 1,555 m.

TucumánSaltaArgentina

🔒 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 3.0 licence, unmodified.