Harrisia gracilis

A slender, sprawling columnar cactus endemic to the dry south coast of Jamaica, carrying large white night-blooming flowers and yellow fruit. It grows hot all year in full sun, needs no cold rest, and should be kept frost-free.

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 dry coastal thorn scrub and on limestone hills and flats, with stems sprawling through or leaning on surrounding shrubs.

Few records carry elevations; the sites are lowland coastal scrub from near sea level to a few hundred metres.

Jamaica

🔒 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 4.0 licence, unmodified.