Cleistocactus viridiflorus

A clumping columnar cactus about 2–3 m tall, from the dry inter-Andean valleys of Bolivia. It has green to yellow-green tubular flowers that barely open. It needs full sun, a dry winter rest and cold nights. It takes light frost when kept dry.

At home, aim for

Day Cool-growingTargets in Plantistry

Night A clear drop at nightTargets 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

It grows on stony slopes among shrubs and small trees in dry Andean valleys.

Records run from 2,550 to 3,458 m (median 2,750 m). Wikipedia gives 1,400–3,200 m.

BoliviaCochabambaChuquisacaPotosí

🔒 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 3.0 licence, unmodified.