Echinopsis hahniana

A slender, sprawling to semi-erect columnar cactus from the dry Chaco woodland of Paraguay, with stems up to 1 m tall but only 1.5–3 cm thick and large creamy white night flowers. It grows in the shade of woodland on alkaline clay, so it wants bright but not blazing light and a warm, fairly even climate.

At home, aim for

Day Warm-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

Dry Chaco woodland on alkaline clay, growing in the shade of shrubs and trees.

Reported at 200–500 m; the two Paraguayan climate sites are at about 80–90 m in the Chaco lowlands.

Paraguay (Presidente Hayes)

🔒 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.