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Begonias Well documented

Begonia masoniana

Iron cross begonia

The iron cross begonia is a rhizomatous species from the limestone karst of southwestern Guangxi, China, and neighbouring northern Vietnam. Each hairy, puckered leaf has a dark cross-shaped mark. In the wild it grows on rocks in shaded forest, around cave-like hollows at low elevations (about 100–350 m), in a monsoon climate with a cool, dry winter. It is easy to grow indoors if it gets steady warmth, moderate to high humidity and a free-draining mix that is never waterlogged.

Begonia masoniana
Photo: Salix, CC BY-SA 3.0, via Wikimedia Commons
At home, aim for
Day IntermediateTargets in Plantistry
Night Close to the dayTargets in Plantistry
Humidity Ordinary room humidityBand in Plantistry
Light ShadeDLI and PPFD in Plantistry
Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

Grows on rocks and in thin soil under forest on limestone hills, in moist, shaded spots such as karst walls, cave entrances and hollows. The populations are small and isolated, confined to cave-like microhabitats in the karst.

The Flora of Guangxi gives 100–350 m. The 12 wild records with elevations fall at 222–340 m, median 290 m, which agrees.

China: Guangxi (Longzhou, Pingxiang)Vietnam (north)

🔒 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-SA 3.0 licence, unmodified.