UK hardiness
Is Curio Rowleyanus hardy in the UK?
Curio rowleyanus
More about curio rowleyanus in the UK
Curio Rowleyanus and the RHS hardiness rating
Curio Rowleyanus 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 curio rowleyanus USDA hardiness guide.
Does UK region change it?
Because curio rowleyanus 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 curio rowleyanus in the UK
Overwintering curio rowleyanus 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.
Curio Rowleyanus UK hardiness — frequently asked questions
Is curio rowleyanus hardy in the UK?
Curio Rowleyanus 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 curio rowleyanus stay outside over winter in the UK?
No. Curio Rowleyanus 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). Curio Rowleyanus'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 curio rowleyanus in the UK?
Overwintering curio rowleyanus 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 curio rowleyanus survives?
Because curio rowleyanus 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 curio rowleyanus care
See the full curio rowleyanus care guide, its temperature & humidity needs, and the US (USDA) hardiness version of this page.