Cold hardiness & minimum temperature

Is Celadine Frangipani (Plumeria rubra 'Celadine')cold hardy? Hardiness zone & min temp

Also called Celadine Frangipani, Celadine Plumeria.

More about celadine frangipani

About Celadine Frangipani

Plumeria rubra 'Celadine' · also called Celadine Frangipani, Celadine Plumeria · tropical

Plumeria rubra 'Celadine' is a classic cultivar bearing large, intensely fragrant golden-yellow flowers with a rich orange-red blush at the centre. A vigorous deciduous small tree, it responds well to full sun and sharp drainage, making it a prized specimen in tropical gardens and a favourite in the lei and ornamental trade.

Cold limit: USDA 10b–12 · RHS H1a (13–38 °C)

Watch for — Crown rot at dormancy: Storing plants cold and wet when leafless leads to soft, discoloured rotting at the stem base and at the crown. Overwinter in frost-free conditions above 10 °C, water sparingly, and ensure adequate ventilation. Treat early rot by cutting back to clean tissue and dusting with sulphur powder.

What celadine frangipani's hardiness rating actually means

Celadine Frangipani 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 H1a means: Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever. On the US scale that maps to USDA 10b–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 above about 15 °C (warm, never cold). Celadine Frangipani has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for celadine frangipani as it gets too cold:

Below about above about 15 °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 celadine frangipani go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above above 15 °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 celadine frangipani can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Celadine Frangipani hardiness — frequently asked questions

Is celadine frangipani cold hardy?

Celadine Frangipani 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. Celadine Frangipani can only live outside year-round in genuinely frost-free climates (roughly USDA 10b–12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature celadine frangipani can survive?

Minimum survivable temperature is roughly above about 15 °C (warm, never cold). Celadine Frangipani has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is celadine frangipani?

Celadine Frangipani is rated USDA 10b–12 and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can celadine frangipani survive winter outside?

It can holiday outdoors in summer once nights are reliably above above 15 °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 celadine frangipani below its minimum temperature?

Below about above about 15 °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.