Cold hardiness & minimum temperature

Is Short-winged Wax Plant (Hoya brevialata)cold hardy? Hardiness zone & min temp

Also called Short-winged wax plant, Wax plant.

More about short-winged wax plant

About Short-winged Wax Plant

Hoya brevialata · also called Short-winged wax plant, Wax plant · tropical

Hoya brevialata is a prostrate and pendant epiphyte native to Sulawesi, Indonesia, where it grows in primary forest and clove plantations at elevations up to 600 m. It thrives in bright indirect light, warm temperatures, and high humidity, requiring a very open, free-draining bark-based mix to replicate its epiphytic roots. The most important care point is to allow the mix to partially dry between waterings, as roots are highly sensitive to persistent moisture. The ASPCA lists the Hoya genus as non-toxic to cats, dogs, and horses.

Cold limit: USDA 11–12 (indoor in most climates) · RHS H1b (18–29 °C)

What short-winged wax plant's hardiness rating actually means

Short-winged Wax Plant is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Its RHS rating of H1b means: Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season. On the US scale that maps to USDA 11–12 (indoor in most climates) — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly about 10 °C (sustained cold below this is damaging). Short-winged Wax Plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for short-winged wax plant as it gets too cold:

Below about about 10 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches.
A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover.
Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.

Can short-winged wax plant go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 10 °C, in shade or dappled light, hardened off gradually.
Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C.
It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when short-winged wax plant can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Short-winged Wax Plant hardiness — frequently asked questions

Is short-winged wax plant cold hardy?

Short-winged Wax Plant is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Indoor-only in almost every home. Short-winged Wax Plant can only live outside year-round in genuinely frost-free climates (roughly USDA 11–12 (indoor in most climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature short-winged wax plant can survive?

What hardiness zone is short-winged wax plant?

Short-winged Wax Plant is rated USDA 11–12 (indoor in most climates) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can short-winged wax plant survive winter outside?

It can holiday outdoors in summer once nights are reliably above 10 °C, in shade or dappled light, hardened off gradually. Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C. It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

What happens to short-winged wax plant below its minimum temperature?

Below about about 10 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches. A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover. Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.