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