Cold hardiness & minimum temperature

Is Duvalia caespitosa (Duvalia caespitosa)cold hardy? Hardiness zone & min temp

Also called clumping duvalia.

More about duvalia caespitosa

About Duvalia caespitosa

Duvalia caespitosa · also called clumping duvalia · houseplant

Duvalia caespitosa is a dwarf clustering stapeliad from South Africa with small, blunt, grey-green four-angled stems that creep into low mats. It produces star-shaped, dark maroon carrion flowers in late summer. Grown as a curiosity succulent indoors, it needs sharp drainage, bright light, and a bone-dry winter rest to avoid stem rot.

Cold limit: USDA 10-11 (indoor in most US homes) · RHS H1b (18-27°C)

Watch for — Stem and root rot: The most common cause of death. Triggered by overwatering, dense soil, or winter moisture. Keep nearly dry in winter and use a gritty, free-draining mix.

What duvalia caespitosa's hardiness rating actually means

Duvalia caespitosa 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 10-11 (indoor in most US homes) — 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). Duvalia caespitosa has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for duvalia caespitosa 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 duvalia caespitosa 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 duvalia caespitosa can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Duvalia caespitosa hardiness — frequently asked questions

Is duvalia caespitosa cold hardy?

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

What is the minimum temperature duvalia caespitosa can survive?

What hardiness zone is duvalia caespitosa?

Duvalia caespitosa is rated USDA 10-11 (indoor in most US homes) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can duvalia caespitosa 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 duvalia caespitosa 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.