Oncidium leucochilum

A large epiphytic Oncidium from the highland forests of southern Mexico, Guatemala, Honduras and El Salvador, usually around 1,500–2,300 m. Egg-shaped pseudobulbs carry two leaves and very long branched spikes, sometimes several metres long, of waxy, fragrant, long-lasting green-and-brown flowers with a white lip. It prefers cool to intermediate conditions and experiences a sharp, sunny dry season in winter.

At home, aim for

Day IntermediateTargets in Plantistry

Night A clear drop at nightTargets in Plantistry

Humidity Ordinary room humidityBand in Plantistry

Light Bright, filtered lightDLI and PPFD in Plantistry

Expects a seasonal restGrows on trees (epiphyte)

Where it grows wild

Epiphytic on trees in both dry and humid forests of the highlands. Plants get bright light and good air movement, and the long inflorescences hang or scramble through the branches.

Recorded elevations are 422–2,364 m, median 1,706 m. Wikipedia gives about 2,000 m. It is a cool-to-intermediate highland plant.

Mexico SoutheastGuatemalaHondurasEl Salvador

🔒 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.