Harrisia regelii

A sprawling to arching, 4–5-ribbed cactus from the lowlands of Entre Ríos, Santa Fe and Uruguay. It bears large white night flowers and red fruit. It handles a humid subtropical climate with cool winters and occasional light frost, which makes it one of the tougher Harrisia.

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

Grows in lowland scrub and open woodland (espinal), sprawling through and leaning on shrubs. It sits in sun to light shade. This is inferred from the genus and the region, since the species' habitat is poorly described.

Few records carry an elevation. The region is low-lying, mostly under 200 m.

Argentina NortheastUruguay

🔒 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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More Harrisia

Harrisia fragrans Harrisia bonplandii Harrisia martinii Harrisia pomanensis Harrisia portoricensis Harrisia aboriginum Harrisia gracilis Harrisia tortuosa Harrisia adscendens Harrisia tetracantha Harrisia divaricata Harrisia eriophora All 18 →

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.