Marcgravia magnibracteata

A large-bracted Marcgravia of the Guianas, described in 1940 from Suriname and since found in the interior of French Guiana. Known from only a handful of collections, it is a rainforest root-climber of the Guiana Shield that experiences a distinct September to November dry season, so growers should give warm, humid conditions with a mild late-year easing of watering.

At home, aim for

Day Warm-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Humid airBand in Plantistry

Light ShadeDLI and PPFD in Plantistry

No rest periodClimber

Where it grows wild

Lowland to lower-montane rainforest on the Guiana Shield, on trunks in the shaded understory as a shingling juvenile and reaching the mid-canopy as an adult with free-hanging fertile branches. One French Guiana site is on a granite inselberg massif at about 790 m.

Records from about 170 m to nearly 800 m; the type from lowland Suriname.

French GuianaSuriname

🔒 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.