Cold hardiness & minimum temperature

Is Noble Carrion Flower (Stapelia nobilis)cold hardy? Hardiness zone & min temp

Also called Noble Carrion Flower, Carrion Flower.

More about noble carrion flower

About Noble Carrion Flower

Stapelia nobilis · also called Noble Carrion Flower, Carrion Flower · houseplant

Stapelia nobilis is a clump-forming South African succulent with upright, four-angled toothed stems that produces large, hairy, star-shaped flowers in reddish-purple and yellow — foul-smelling to attract fly pollinators. Spineless and drought-tolerant, it suits a bright sunny indoor spot and is best moved outdoors in summer to encourage flowering.

Cold limit: USDA 10–11 · RHS H2 (10–35°C)

Watch for — Stem rot from overwatering: Basal stem rot is the leading cause of plant loss, especially in cool, wet winter conditions. Remove rotted stems immediately, dust with fungicide or sulphur, and allow remaining healthy stems to dry before re-potting in fresh compost.

What noble carrion flower's hardiness rating actually means

Noble Carrion Flower is half-hardy (RHS H2). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Its RHS rating of H2 means: Tender — survives a frost-free greenhouse or a very mild, sheltered spot. On the US scale that maps to USDA 10–11 — 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 1 to 5 °C — tolerates cold but no real frost. Noble Carrion Flower shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for noble carrion flower as it gets too cold:

Down to roughly about 1 to 5 °C it copes, especially if dry and sheltered.
A sustained hard frost collapses the top growth; whether it returns depends on whether the roots, crown or tubers froze.
Wet cold is far more lethal than dry cold for this plant — soggy, frozen soil is the usual killer.

Can noble carrion flower go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 10–11 or a frost-free UK microclimate.
In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter.
A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

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 noble carrion flower can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H2 figure above.

Frost protection for borderline noble carrion flower

Noble Carrion Flower is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost.
Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse.
Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones.
Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.

Noble Carrion Flower hardiness — frequently asked questions

Is noble carrion flower cold hardy?

Noble Carrion Flower is half-hardy (RHS H2). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Borderline outdoors. In its mild end of USDA 10–11 (and sheltered UK gardens) noble carrion flower can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature noble carrion flower can survive?

Minimum survivable temperature is roughly about 1 to 5 °C — tolerates cold but no real frost. Noble Carrion Flower shrugs off cold nights but a real, sustained freeze will kill it.

What hardiness zone is noble carrion flower?

Noble Carrion Flower is rated USDA 10–11 and RHS H2 — Tender — survives a frost-free greenhouse or a very mild, sheltered spot.

Can noble carrion flower survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 10–11 or a frost-free UK microclimate. In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter. A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

How do I protect noble carrion flower from frost?

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost. Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse. Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones. Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.