Cold hardiness & minimum temperature

Is Crassula Hummel's Sunset (Crassula ovata 'Hummel's Sunset')cold hardy? Hardiness zone & min temp

Also called Hummel's sunset jade, golden jade.

More about crassula hummel's sunset

About Crassula Hummel's Sunset

Crassula ovata 'Hummel's Sunset' · also called Hummel's sunset jade, golden jade · houseplant

Crassula 'Hummel's Sunset' is a variegated jade plant whose thick oval leaves turn gold and ruby-red in bright light. A slow-growing succulent shrub, it stores water in fleshy leaves and stems, wants plenty of sun and gritty, fast-draining soil, and needs only occasional watering. An award-winning, easy-care plant that is toxic to pets.

Cold limit: USDA 10-11 (indoor in most US homes) · RHS H1c (18-24°C)

Watch for — Root and stem rot from overwatering: The leading cause of jade decline. Let the soil dry fully between waterings, use gritty mix, and reduce water sharply in winter.

What crassula hummel's sunset's hardiness rating actually means

Crassula Hummel's Sunset 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 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 5 °C (and never frost). Crassula Hummel's Sunset has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for crassula hummel's sunset 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 crassula hummel's sunset 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 crassula hummel's sunset can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Crassula Hummel's Sunset hardiness — frequently asked questions

Is crassula hummel's sunset cold hardy?

Crassula Hummel's Sunset 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. Crassula Hummel's Sunset 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 crassula hummel's sunset can survive?

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

What hardiness zone is crassula hummel's sunset?

Crassula Hummel's Sunset is rated USDA 10-11 (indoor in most US homes) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can crassula hummel's sunset 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 crassula hummel's sunset 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.