Discocactus hartmannii

A critically endangered disc-shaped Discocactus from sandy grasslands and stony hills of west-central Brazil and Paraguay. It wants heat, strong light and a mineral, sandy mix, and should never be kept cold.

At home, aim for

Day Warm-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Full sunDLI and PPFD in Plantistry

Expects a seasonal restGrows in the ground

Where it grows wild

Seasonally dry tropical grassland and stony hills, on silt, sand, gravel or mica-rich rocky soil, among grasses that give a little side shade.

280–700 m per Wikipedia; the measured records carry no elevation.

Mato Grosso do SulGoiásParaguay

🔒 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.