Hoya siamica

A slender hoya from the mountains of northern Thailand, Indochina and Yunnan, related to Hoya longifolia, with long narrow light green leaves and clusters of 10–15 small, fuzzy, lightly scented white flowers in summer. It was first found on Doi Suthep near Chiang Mai at about 1500–1650 m, so it wants warm days, cooler nights and a drier, cooler winter.

At home, aim for

Day IntermediateTargets in Plantistry

Night Close to the dayTargets 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

It grows as a slender epiphytic vine in montane forest, where it was first collected on Doi Suthep. The corona changes from deep purple to pale yellow depending on how much light the plant gets, showing it grows in a range of light from shade to fairly bright positions.

Type locality at about 1500–1650 m on Doi Suthep; also recorded from the Gaoligong mountains of Yunnan.

ThailandChinaIndochina

🔒 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 Public domain licence, unmodified.