Cold hardiness & minimum temperature

Is Selenicereus pteranthus (Selenicereus pteranthus)cold hardy? Hardiness zone & min temp

Also called Princess of the Night, Night-Blooming Cereus.

More about selenicereus pteranthus

About Selenicereus pteranthus

Selenicereus pteranthus · also called Princess of the Night, Night-Blooming Cereus · flowering

A sprawling, climbing epiphytic cactus from Mexico and Central America, prized for huge, vanilla-scented white flowers that open for a single night before wilting at dawn. The angular blue-green stems clamber by aerial roots and reach for the moonlight. Cool autumn nights and a dry winter rest trigger its dramatic, fleeting summer bloom.

Cold limit: USDA 10-11 (indoor or frost-free outdoor only) · RHS H1c (15-28°C)

Watch for — No flowers: Usually from too much warmth and water in winter, or too little light. Give a cool, dry rest (around 12-15°C) for several weeks and bright light in early spring to set buds.

What selenicereus pteranthus's hardiness rating actually means

Selenicereus pteranthus 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 10-11 (indoor or frost-free outdoor only) — 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). Selenicereus pteranthus has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for selenicereus pteranthus 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 selenicereus pteranthus 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 selenicereus pteranthus can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Selenicereus pteranthus hardiness — frequently asked questions

Is selenicereus pteranthus cold hardy?

Selenicereus pteranthus 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. Selenicereus pteranthus can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (indoor or frost-free outdoor only)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature selenicereus pteranthus can survive?

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

What hardiness zone is selenicereus pteranthus?

Selenicereus pteranthus is rated USDA 10-11 (indoor or frost-free outdoor only) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can selenicereus pteranthus 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 selenicereus pteranthus 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.