Gymnocalycium horstii

A glossy green, squat globular cactus up to 20 cm across from rock outcrops in the grasslands of Rio Grande do Sul, with large creamy white to pink flowers. It is endangered in the wild but easy in cultivation if it gets bright light, summer water and a cool, drier 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

Rock outcrops in open grassland, where plants sit in crevices and thin soil with some shelter from surrounding grass and rocks.

Reported above 300 m; the single climate site is at 561 m.

Brazil (Rio Grande do Sul)

🔒 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.