Begonia tonkinensis

A little-known Begonia of sect. Diploclinium, described by Gagnepain in 1919 from northern Vietnam (Tonkin). It is rarely collected, and nearly all its care has to be inferred from a single measured site in the lowland hills of Thai Nguyen. That site has hot, wet summers and a cool, dry winter. Grow it warm and shaded in summer, and cooler and slightly drier in winter.

At home, aim for

Day IntermediateTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Humid airBand in Plantistry

Light ShadeDLI and PPFD in Plantistry

Expects a seasonal restGrows in the ground

Where it grows wild

No habitat descriptions were found. Like most Southeast Asian Begonia it is presumably a shade herb of moist forest, on the forest floor, banks or rocks. Herbarium localities include lowland hills near La The in Thai Nguyen, Vo Xa, and Sa Pa (Cha-pa) in the northern mountains.

The only record with an elevation is from 225 m in Thai Nguyen. A historical specimen from Sa Pa suggests it may also reach well over 1,000 m, but that label has no elevation.

Vietnam

🔒 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.