Cold hardiness & minimum temperature

Is Cloud Liveforever (Dudleya nubigena)cold hardy? Hardiness zone & min temp

Also called Cloud Liveforever.

More about cloud liveforever

About Cloud Liveforever

Dudleya nubigena · also called Cloud Liveforever · houseplant

Cloud Liveforever is a high-elevation California native Dudleya found on rocky outcrops in the mountains of southern California, often in cloud-influenced, cooler microclimates. It forms silvery glaucous rosettes adapted to cool, moist winters and dry summers. It requires full sun, very sharp drainage, cool temperatures, and a strict summer dry period to thrive in cultivation.

Cold limit: USDA 8-10 · RHS H3 (2–26°C)

Watch for — Insufficient winter chill: This mountain species benefits from cool winter temperatures (5–12°C) during its growing season to remain compact and flower reliably. Kept too warm indoors in winter, it may grow weakly and fail to produce flowers. An unheated greenhouse or cold windowsill is ideal.

What cloud liveforever's hardiness rating actually means

Cloud Liveforever is half-hardy (RHS H3). 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 H3 means: Half-hardy — comes through mild UK winters outside but is killed by a hard freeze. On the US scale that maps to USDA 8-10 — 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 to 1 °C — a light, short frost only. Cloud Liveforever shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for cloud liveforever as it gets too cold:

Down to roughly about −5 to 1 °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 cloud liveforever go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 8-10 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 cloud liveforever can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H3 figure above.

Frost protection for borderline cloud liveforever

Cloud Liveforever 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.

Cloud Liveforever hardiness — frequently asked questions

Is cloud liveforever cold hardy?

Cloud Liveforever is half-hardy (RHS H3). 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 8-10 (and sheltered UK gardens) cloud liveforever can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature cloud liveforever can survive?

Minimum survivable temperature is roughly about −5 to 1 °C — a light, short frost only. Cloud Liveforever shrugs off cold nights but a real, sustained freeze will kill it.

What hardiness zone is cloud liveforever?

Cloud Liveforever is rated USDA 8-10 and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can cloud liveforever survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 8-10 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 cloud liveforever 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.