Cold hardiness & minimum temperature

Is slender lipstick plant (Aeschynanthus gracilis)cold hardy? Hardiness zone & min temp

Also called slender lipstick plant, graceful lipstick vine.

More about slender lipstick plant

About slender lipstick plant

Aeschynanthus gracilis · also called slender lipstick plant, graceful lipstick vine · houseplant

Aeschynanthus gracilis is a slender-stemmed, trailing tropical gesneriad from Southeast Asian forests, bearing narrow, elongated leaves and tubular scarlet to orange-red flowers emerging from dark calyces. Its graceful cascading habit makes it ideal for hanging baskets and high shelves. It requires warm, humid conditions and bright indirect light to flower freely indoors.

Cold limit: USDA 11-12 · RHS H1c (17–28°C)

Watch for — Spider mites in dry conditions: Low indoor humidity — particularly in centrally heated rooms in winter — encourages spider mite colonies on the undersides of the narrow leaves. Raise humidity and treat with insecticidal soap or neem oil; repeat every 5–7 days for three applications.

What slender lipstick plant's hardiness rating actually means

slender 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 11-12 — 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). slender lipstick plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for slender 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 slender 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 slender 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.

slender lipstick plant hardiness — frequently asked questions

Is slender lipstick plant cold hardy?

slender 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. slender lipstick plant can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature slender lipstick plant can survive?

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

What hardiness zone is slender lipstick plant?

slender lipstick plant is rated USDA 11-12 and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can slender 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 slender 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.