UK hardiness
Is Begonia 'Jurassic Silver Swirl' hardy in the UK?
Begonia rex-cultorum 'Jurassic Silver Swirl'
More about begonia 'jurassic silver swirl' in the UK
Begonia 'Jurassic Silver Swirl' and the RHS hardiness rating
Begonia 'Jurassic Silver Swirl' is rated RHS H1b — heated glasshouse — subtropical, meaning it withstands winter minimums of about 10 to 15°C. In practice that means it indoors over winter; can summer outdoors once nights are reliably mild. 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 begonia 'jurassic silver swirl' USDA hardiness guide.
Does UK region change it?
Because begonia 'jurassic silver swirl' 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 begonia 'jurassic silver swirl' in the UK
Overwintering begonia 'jurassic silver swirl' 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.
Begonia 'Jurassic Silver Swirl' UK hardiness — frequently asked questions
Is begonia 'jurassic silver swirl' hardy in the UK?
Begonia 'Jurassic Silver Swirl' is rated RHS H1b (heated glasshouse — subtropical, hardy to about 10 to 15°C). It is not winter-hardy anywhere in the UK and must be overwintered under cover.
Can begonia 'jurassic silver swirl' stay outside over winter in the UK?
No. Begonia 'Jurassic Silver Swirl' 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 H1b mean?
RHS hardiness ratings run H1a (needs a heated glasshouse) to H7 (survives below -20°C). Begonia 'Jurassic Silver Swirl''s rating, H1b, means heated glasshouse — subtropical — it tolerates winter minimums of about 10 to 15°C. The rating is an absolute minimum, not an average.
How do I overwinter begonia 'jurassic silver swirl' in the UK?
Overwintering begonia 'jurassic silver swirl' 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 begonia 'jurassic silver swirl' survives?
Because begonia 'jurassic silver swirl' 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 begonia 'jurassic silver swirl' care
See the full begonia 'jurassic silver swirl' care guide, its temperature & humidity needs, and the US (USDA) hardiness version of this page.