Begonia eiromischa

Woolly-stalked begonia

A lowland begonia known only from two historic collections on Pulau Betong, Penang Island, Malaysia, where it grew on granite rocks near dipterocarp forest at about 170 m. The IUCN declared it extinct in 2007 after repeated surveys failed to find it and its habitat was cleared for farming and logging. It is not known in cultivation, so plants offered under this name are almost certainly something else.

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 periodGrows on rock (lithophyte)

Where it grows wild

It grew on granite rocks at the edge of lowland dipterocarp forest. Such sites in Penang are typically shaded, humid rock faces and boulders near streams. The habitat was destroyed by agriculture and logging.

The only locality is at about 170 m on Pulau Betong, at the south-western end of Penang Island.

Malaysia: Penang Island (Pulau Betong)

🔒 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.