UK hardiness
Is Elephant bush hardy in the UK?
Portulacaria afra
More about elephant bush in the UK
Elephant bush and the RHS hardiness rating
Elephant bush is rated RHS H1b (10-15°C minimum; grow under glass or as a houseplant, stand outdoors only in summer) — 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 elephant bush USDA hardiness guide.
Does UK region change it?
Because elephant bush 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 elephant bush in the UK
Overwintering elephant bush 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.
Elephant bush UK hardiness — frequently asked questions
Is elephant bush hardy in the UK?
Elephant bush is rated RHS H1b (10-15°C minimum; grow under glass or as a houseplant, stand outdoors only in summer) (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 elephant bush stay outside over winter in the UK?
No. Elephant bush 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 (10-15°C minimum; grow under glass or as a houseplant, stand outdoors only in summer) mean?
RHS hardiness ratings run H1a (needs a heated glasshouse) to H7 (survives below -20°C). Elephant bush's rating, H1b (10-15°C minimum; grow under glass or as a houseplant, stand outdoors only in summer), 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 elephant bush in the UK?
Overwintering elephant bush 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 elephant bush survives?
Because elephant bush 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 elephant bush care
See the full elephant bush care guide, its temperature & humidity needs, and the US (USDA) hardiness version of this page.