Gymnocalycium reductum

A low, globular Gymnocalycium of the hill ranges of southern Buenos Aires province (the Tandilia and Ventania systems), at the cold southern edge of the genus. It takes full sun, a genuinely cold winter and year-round moderate rain; grow it bright, keep it cool and dry over winter.

At home, aim for

Day IntermediateTargets 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 on rock (lithophyte)

Where it grows wild

Grows in rock crevices and thin soil among grasses on quartzite and granite hills rising out of the pampas.

Records lie at about 100–450 m, on the hill ranges.

Argentina (Buenos Aires)Uruguay

🔒 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 4.0 licence, unmodified.