Pilosocereus armatus

A tall, branching columnar cactus of the dry coastal scrub of Puerto Rico and the Virgin Islands, with ribbed blue-green to green stems and white nocturnal flowers. It needs warmth year round, full sun and a mineral soil, and should never be kept cold.

At home, aim for

Day Warm-growingTargets in Plantistry

Night Close to the dayTargets 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

Grows in subtropical dry forest and coastal thorn scrub on limestone and rocky slopes, standing above the low woody vegetation in full sun.

Few records carry elevation; it is a lowland species of coastal hills, mostly below about 300 m.

Puerto RicoU.S. Virgin IslandsBritish Virgin Islands

🔒 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.