Cold hardiness & minimum temperature

Is Royal Red Lipstick Plant (Aeschynanthus pulcher)cold hardy? Hardiness zone & min temp

Also called Lipstick Plant, Royal Red Lipstick Vine, Basket Plant.

More about royal red lipstick plant

About Royal Red Lipstick Plant

Aeschynanthus pulcher · also called Lipstick Plant, Royal Red Lipstick Vine · houseplant

Royal Red Lipstick Plant is a trailing epiphytic gesneriad prized for its vivid scarlet tubular flowers that emerge from dark burgundy calyces, resembling lipstick. Its glossy, succulent leaves and cascading habit make it ideal for hanging baskets. ASPCA-listed non-toxic — safe around cats and dogs.

Cold limit: USDA 10-12 (indoor-only in most homes) · RHS H1c (18-27°C)

Watch for — Sparse or no flowers: Usually caused by low light or pot-bound avoidance (this plant PREFERS to be slightly root-bound). Ensure bright indirect light and a cool, drier winter rest of 6-8 weeks to stimulate bud set.

What royal red lipstick plant's hardiness rating actually means

Royal Red 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 10-12 (indoor-only in most homes) — 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 5 °C (and never frost). Royal Red Lipstick Plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for royal red lipstick plant as it gets too cold:

Below about about 5 °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 royal red lipstick plant go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °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 royal red lipstick plant can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Royal Red Lipstick Plant hardiness — frequently asked questions

Is royal red lipstick plant cold hardy?

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

What is the minimum temperature royal red lipstick plant can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Royal Red Lipstick Plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is royal red lipstick plant?

Royal Red Lipstick Plant is rated USDA 10-12 (indoor-only in most homes) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can royal red lipstick plant survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °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 royal red lipstick plant below its minimum temperature?

Below about about 5 °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.