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