Cold hardiness & minimum temperature

Is Eitape Wax Plant (Hoya eitapensis)cold hardy? Hardiness zone & min temp

Also called Eitape wax plant, Wax plant.

More about eitape wax plant

About Eitape Wax Plant

Hoya eitapensis · also called Eitape wax plant, Wax plant · tropical

Hoya eitapensis is a climbing epiphytic wax plant native to lowland rainforest near Eitape in north-west Papua New Guinea, where it grows on trees at around 20 m elevation. It is prized by collectors for its light-green leaves that develop a striking red blush when exposed to bright light, and for its star-shaped white flowers with a yellow corona that carry a delicate fragrance. Water sparingly and use a fast-draining mix — this species is highly sensitive to root rot. The ASPCA lists the Hoya genus as non-toxic to cats and dogs.

Cold limit: USDA 11–12 (indoor in most climates) · RHS H1b (18–30°C)

What eitape wax plant's hardiness rating actually means

Eitape 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). Eitape Wax Plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for eitape 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 eitape 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 eitape 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.

Eitape Wax Plant hardiness — frequently asked questions

Is eitape wax plant cold hardy?

Eitape 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. Eitape 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 eitape wax plant can survive?

What hardiness zone is eitape wax plant?

Eitape 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 eitape 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 eitape 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.