Cold hardiness & minimum temperature

Is Small-leaf Lipstick Plant (Aeschynanthus parvifolius)cold hardy? Hardiness zone & min temp

Also called Small-leaf Lipstick Plant, Small-leaved Basket Plant.

More about small-leaf lipstick plant

About Small-leaf Lipstick Plant

Aeschynanthus parvifolius · also called Small-leaf Lipstick Plant, Small-leaved Basket Plant · tropical

Aeschynanthus parvifolius is an epiphytic trailing plant from the humid rainforests of Southeast Asia, bearing notably smaller leaves than the more common lipstick vine species while still producing the characteristic tubular red flowers that emerge from dark calyces. It excels in hanging baskets where its slender, trailing stems can cascade freely. High humidity and consistently warm temperatures are the most critical care requirements for this species. The ASPCA lists Aeschynanthus (lipstick plant) as non-toxic to cats and dogs.

Cold limit: USDA 10-12 (indoor in most climates) · RHS H1b (16–26°C)

Watch for — Failure to flower: Most often caused by insufficient light or excessively warm, constant temperatures; a slight temperature drop to around 15°C for 4–6 weeks in late autumn can trigger bud set.

What small-leaf lipstick plant's hardiness rating actually means

Small-leaf 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). Small-leaf Lipstick Plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for small-leaf 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 small-leaf 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 small-leaf 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.

Small-leaf Lipstick Plant hardiness — frequently asked questions

Is small-leaf lipstick plant cold hardy?

Small-leaf 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. Small-leaf 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 small-leaf lipstick plant can survive?

What hardiness zone is small-leaf lipstick plant?

Small-leaf 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 small-leaf 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 small-leaf 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.