Is Crassula Marnieriana hardy in the UK?

Crassula Marnieriana and the RHS hardiness rating

Crassula Marnieriana is rated RHS H2 (tender; keep above about 5-10°C, protect from frost) — tender, meaning it withstands winter minimums of about 1 to 5°C. In practice that means it needs a frost-free greenhouse or indoors over winter — a UK frost will kill it. 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 marnieriana USDA hardiness guide.

Does UK region change it?

Because crassula marnieriana 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 marnieriana in the UK

Overwintering crassula marnieriana 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.

More crassula marnieriana care

See the full crassula marnieriana care guide, its temperature & humidity needs, and the US (USDA) hardiness version of this page.

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