Harrisia tortuosa

A sprawling to arching cactus with slender, ribbed, spiny stems and large white night-blooming flowers followed by red fruit, native to the Chaco and Espinal of northern Argentina and neighbouring countries. It wants full sun and hot, wet summers, and tolerates a cool, dry winter with light frost; it is invasive in parts of Australia.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Ordinary room humidityBand in Plantistry

Light Full sunDLI and PPFD in Plantistry

Expects a seasonal restGrows in the ground

Where it grows wild

Dry forest, thornscrub and open woodland edges on the plains of the Chaco and Espinal, scrambling among shrubs or forming low thickets in full sun to light shade.

Lowland: 85–950 m, median about 280 m (few records with elevation).

Argentina NortheastParaguayBoliviaBrazil West-CentralUruguay

🔒 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 CC0 licence, unmodified.