Harrisia martinii

A scrambling, thin-stemmed night-flowering cactus of the Paraguayan and northeast Argentine Chaco that leans through shrubs and grows from tuberous roots. It is vigorous and easy, takes summer rain and heat, and has become a serious weed where it escaped in Australia and South Africa.

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

Chaco thorn scrub, dry woodland edges and savanna, where the stems sprawl or climb through bushes in part shade and sun.

Lowland plains; the measured sites lie between about 5 and 80 m.

Argentina NortheastParaguay

🔒 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-SA 4.0 licence, unmodified.