Plant care
Hoya pubicalyxtemperature & humidity
Hoya pubicalyx
More about hoya pubicalyx
Ideal temperature for hoya pubicalyx
Aim for 16-29°C (61-85°F) on the thermostat and you've handled the easy part. The hard part is the half-metre around the plant: window glass that drops to near-freezing on a January night, a radiator pumping out hot dry air, a draught from an opened front door. Move the plant 30 cm and you've usually fixed the problem. Below roughly 16°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Hoya pubicalyx is frost-tender (USDA 10a-11b, RHS H1B (min 10-15°C; grow under glass / as a houseplant in the UK)). It cannot survive a frost, so in most of the US and UK it lives indoors year-round or summers outside and comes back in well before the first autumn frost — once nights drop toward 10-12°C is the cue, not the first frost warning. Acclimate it over a week when moving between indoors and out so the leaves do not shock.
Humidity for hoya pubicalyx
Hoya pubicalyx sits happiest at around 60-70% relative humidity. It enjoys higher humidity of around 60-70%, reflecting its tropical rainforest origins, and grows fastest in those conditions. That said, it tolerates average household humidity better than most tropicals thanks to its thick leaves. A pebble tray or nearby humidifier helps; skip heavy misting, as water sitting on leaves invites fungal spotting. The usual low-humidity tell is crisp brown leaf tips and edges while the soil moisture is fine — a sign the air, not the watering, is the problem. If you need to raise it, the reliable methods are grouping plants together, standing the pot on a tray of damp pebbles (the pot above the waterline, never in it), or running a small humidifier in winter when indoor heating dries the air most. Misting is the least effective — it raises humidity for minutes, not hours.
Hoya pubicalyx temperature & humidity — frequently asked questions
What temperature is best for hoya pubicalyx?
Hoya pubicalyx grows best between 16-29°C (61-85°F). Keep it out of cold draughts, off freezing windowsills in winter, and away from the hot dry air directly above radiators — the extremes matter far more than the average room temperature.
How cold can hoya pubicalyx tolerate?
Hoya pubicalyx starts to suffer below roughly 16°C. It is frost-tender and will be damaged or killed by a frost, so bring it indoors once nights fall toward 10-12°C.
What humidity does hoya pubicalyx need?
Hoya pubicalyx prefers about 60-70% relative humidity. It enjoys higher humidity of around 60-70%, reflecting its tropical rainforest origins, and grows fastest in those conditions. That said, it tolerates average household humidity better than most tropicals thanks to its thick leaves. A pebble tray or nearby humidifier helps; skip heavy misting, as water sitting on leaves invites fungal spotting.
How do I raise humidity for hoya pubicalyx?
Group it with other plants, stand the pot on a tray of damp pebbles (kept above the waterline), or run a small humidifier in winter. Misting only helps for a few minutes, so it is the weakest option for a plant that genuinely needs more humidity.
Can hoya pubicalyx live outside?
Hoya pubicalyx is rated for USDA zone 10a-11b and RHS hardiness H1B (min 10-15°C; grow under glass / as a houseplant in the UK). Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More hoya pubicalyx care
In the UK? Keeping hoya pubicalyx warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full hoya pubicalyx care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.