Cold hardiness & minimum temperature

Is Single-flower Lipstick Plant (Aeschynanthus uniflorus)cold hardy? Hardiness zone & min temp

Also called Single-flower Lipstick Plant, Single-flowered Basket Vine.

More about single-flower lipstick plant

About Single-flower Lipstick Plant

Aeschynanthus uniflorus · also called Single-flower Lipstick Plant, Single-flowered Basket Vine · tropical

Aeschynanthus uniflorus is a rarely cultivated epiphytic species in the Gesneriaceae family, native to the tropical rainforests of Southeast Asia and distinguished from related species by its tendency to produce solitary (single) flowers at each node rather than clustered inflorescences. It shares the trailing, cascading growth habit and bright tubular flowers characteristic of the genus and performs best in hanging baskets indoors with high humidity and warm, stable temperatures. As an epiphyte it is particularly sensitive to root disturbance and overwatering. The ASPCA lists Aeschynanthus (lipstick plant) as non-toxic to cats and dogs.

Cold limit: USDA 10-12 (indoor in most climates) · RHS H1b (16–27°C)

What single-flower lipstick plant's hardiness rating actually means

Single-flower Lipstick 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 10-12 (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). Single-flower Lipstick Plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for single-flower lipstick 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 single-flower lipstick 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 single-flower lipstick plant can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Single-flower Lipstick Plant hardiness — frequently asked questions

Is single-flower lipstick plant cold hardy?

Single-flower Lipstick 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. Single-flower Lipstick Plant can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor in most climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature single-flower lipstick plant can survive?

What hardiness zone is single-flower lipstick plant?

Single-flower Lipstick Plant is rated USDA 10-12 (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 single-flower lipstick 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 single-flower lipstick 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.