Cold hardiness & minimum temperature

Is Pepino Dulce (Solanum muricatum)cold hardy? Hardiness zone & min temp

Also called Pepino dulce, Pepino melon, Sweet cucumber.

More about pepino dulce

About Pepino Dulce

Solanum muricatum · also called Pepino dulce, Pepino melon · tropical

Pepino dulce is a sprawling, evergreen nightshade grown for its melon-and-cucumber-flavoured fruit. It is frost-tender but fast and self-pollinating, fruiting in a single season from cuttings. Give it full sun, steady moisture, free-draining soil and a long warm growing window. In cool climates it crops well in a greenhouse or large container overwintered frost-free.

Cold limit: USDA 9-11 outdoors; grown as a tender annual or overwintered frost-free elsewhere · RHS H1c (15-30°C)

Watch for — Poor fruit set: Cold nights or over-feeding with nitrogen prevents pollination; keep above 12°C at flowering and switch to high-potash feed.

What pepino dulce's hardiness rating actually means

Pepino Dulce is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Its RHS rating of H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 9-11 outdoors; grown as a tender annual or overwintered frost-free elsewhere — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly about 5 °C (and never frost). Pepino Dulce has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for pepino dulce as it gets too cold:

Below about about 5 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches.
A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover.
Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.

Can pepino dulce go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °C, in shade or dappled light, hardened off gradually.
Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C.
It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when pepino dulce can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Pepino Dulce hardiness — frequently asked questions

Is pepino dulce cold hardy?

Pepino Dulce is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Indoor-only in almost every home. Pepino Dulce can only live outside year-round in genuinely frost-free climates (roughly USDA 9-11 outdoors; grown as a tender annual or overwintered frost-free elsewhere); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature pepino dulce can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Pepino Dulce has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is pepino dulce?

Pepino Dulce is rated USDA 9-11 outdoors; grown as a tender annual or overwintered frost-free elsewhere and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can pepino dulce survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °C, in shade or dappled light, hardened off gradually. Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C. It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

What happens to pepino dulce below its minimum temperature?

Below about about 5 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches. A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover. Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.