Cold hardiness & minimum temperature

Is Passiflora edulis (Passiflora edulis)cold hardy? Hardiness zone & min temp

Also called passion fruit, purple granadilla.

More about passiflora edulis

About Passiflora edulis

Passiflora edulis · also called passion fruit, purple granadilla · edible

Passiflora edulis is a vigorous evergreen tropical-to-subtropical vine grown for its aromatic, edible passion fruit. White-and-purple fringed flowers give way to rounded purple (or yellow in some forms) fruits with juicy, seedy pulp. Frost-tender, it is a perennial outdoors in warm climates and a conservatory or greenhouse plant in cooler regions.

Cold limit: USDA 9-11 (frost-tender; grow under glass in cooler zones) · RHS H1c (13 to 30°C)

Watch for — Flower and fruit drop: Caused by drought stress, cold, or lack of pollination; keep soil evenly moist, maintain warmth, and hand-pollinate under glass where bees are absent.

What passiflora edulis's hardiness rating actually means

Hardiness works differently for passiflora edulis: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". 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 (frost-tender; grow under glass in cooler zones) — 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

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

Concretely, for passiflora edulis as it gets too cold:

Light frost (around 0 to −2 °C) damages or kills tender summer crops outright; cold-hardy types take a few degrees of frost.
The plant does not "survive winter" — its life cycle simply ends, by design, when frost arrives or it finishes cropping.
A surprise late spring frost can also kill young transplants set out too early, before the season even starts.

Can passiflora edulis go outside or overwinter — and where?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost.
In short-season zones, start it indoors or under cover to stretch the effective growing window.
Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

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 passiflora edulis can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Frost protection for borderline passiflora edulis

Passiflora edulis is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks.
Have row cover ready for an unexpected late spring or early autumn frost.
Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.

Passiflora edulis hardiness — frequently asked questions

Is passiflora edulis cold hardy?

Hardiness works differently for passiflora edulis: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". A seasonal crop, not a perennial. Passiflora edulis is grown as an annual in USDA 9-11 (frost-tender; grow under glass in cooler zones); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature passiflora edulis can survive?

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

What hardiness zone is passiflora edulis?

Passiflora edulis is rated USDA 9-11 (frost-tender; grow under glass in cooler zones) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can passiflora edulis survive winter outside?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost. In short-season zones, start it indoors or under cover to stretch the effective growing window. Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

How do I protect passiflora edulis from frost?

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks. Have row cover ready for an unexpected late spring or early autumn frost. Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.