UK hardiness
Is Crassula Hummel's Sunset hardy in the UK?
Crassula ovata 'Hummel's Sunset'
More about crassula hummel's sunset in the UK
Crassula Hummel's Sunset and the RHS hardiness rating
Crassula Hummel's Sunset is rated RHS H1c — warm temperate, meaning it withstands winter minimums of about 5 to 10°C. In practice that means it fine outdoors through most UK summers but must come in before the first frost. The RHS rating describes an absolute minimum temperature, not an average: a single hard frost below its band is what does the damage, so the question is always "what is the coldest night my garden gets?", not "what is a typical winter here?".
This follows the RHS plant hardiness rating system (H1a–H7), the UK standard. For the US growing-zone view, see the crassula hummel's sunset USDA hardiness guide.
Does UK region change it?
Because crassula hummel's sunset is frost-tender, UK region matters less than the simple rule: it does not stay outdoors over winter anywhere in the UK. Treat any time outside as a summer holiday — bring it back indoors once nights drop toward 10°C, well before the first frost, and acclimatise it over a week each way so the leaves do not shock.
Overwintering crassula hummel's sunset in the UK
Overwintering crassula hummel's sunset in the UK means bringing it in: a bright, frost-free room or a heated glasshouse, watered sparingly while growth slows. Do not leave it against cold glass or near an unheated porch. Move it back out only after the last spring frost has passed for your area.
Crassula Hummel's Sunset UK hardiness — frequently asked questions
Is crassula hummel's sunset hardy in the UK?
Crassula Hummel's Sunset is rated RHS H1c (warm temperate, hardy to about 5 to 10°C). It is not winter-hardy anywhere in the UK and must be overwintered under cover.
Can crassula hummel's sunset stay outside over winter in the UK?
No. Crassula Hummel's Sunset is frost-tender — a UK frost will kill it. Bring it indoors or into a frost-free greenhouse before the first autumn frost and return it outside only after the last spring frost.
What does RHS H1c mean?
RHS hardiness ratings run H1a (needs a heated glasshouse) to H7 (survives below -20°C). Crassula Hummel's Sunset's rating, H1c, means warm temperate — it tolerates winter minimums of about 5 to 10°C. The rating is an absolute minimum, not an average.
How do I overwinter crassula hummel's sunset in the UK?
Overwintering crassula hummel's sunset in the UK means bringing it in: a bright, frost-free room or a heated glasshouse, watered sparingly while growth slows. Do not leave it against cold glass or near an unheated porch. Move it back out only after the last spring frost has passed for your area.
Does UK region change whether crassula hummel's sunset survives?
Because crassula hummel's sunset is frost-tender, UK region matters less than the simple rule: it does not stay outdoors over winter anywhere in the UK. Treat any time outside as a summer holiday — bring it back indoors once nights drop toward 10°C, well before the first frost, and acclimatise it over a week each way so the leaves do not shock.
More crassula hummel's sunset care
See the full crassula hummel's sunset care guide, its temperature & humidity needs, and the US (USDA) hardiness version of this page.