9 Passionflower Varieties Compared: The Native Maypop That Survives -20°F vs. Tropical Passiflora That Die at 30°F

Buy a plant tagged simply “passionflower” at a big-box garden center and you are gambling blind. The genus Passiflora holds more than 550 species, and the care gap between them is not small — one variety regrows from a frozen-solid root crown every spring in USDA zone 5, while another turns to mush at 30°F and needs to come indoors before the first light frost. Confusing the two is the single most common reason a passionflower “dies” over winter when it was never going to survive that climate in the first place.

This guide compares nine varieties gardeners actually encounter — three hardy natives, two semi-hardy bridge plants, and four tender tropicals — side by side on hardiness, mature size, flower type, and what each one is actually good for. For full planting, pruning, and pest care once you’ve picked your variety, see our passionflower growing guide.

Why “Hardy” and “Tropical” Passionflower Aren’t Just Marketing Labels

The hardy/tropical split isn’t a spectrum of toughness — it’s two different survival strategies, and knowing which one your plant uses tells you exactly what winter will do to it.

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Passiflora incarnata, the native maypop, survives USDA zone 5 (down to -20°F) not because its stems are cold-tolerant — they aren’t. The entire top growth dies back to the ground every winter, and the plant re-sprouts from its root crown the following spring, the same overwintering strategy a hosta or peony uses [1][4]. Passiflora caerulea takes a middle path: it’s woodier and holds a semi-evergreen framework through mild winters (RHS hardiness rating H4, -10 to -5°C / 14-23°F), but a hard freeze past that threshold kills it outright, with no root-crown backup plan [3]. True tropical species like P. edulis have no cold-hardy reserve at all — damage starts below roughly 30°F, and the plant simply doesn’t come back [6].

That distinction is why a “hardy passionflower” surviving your winter and a “tropical passionflower” surviving your winter are two completely different bets — one is a herbaceous perennial that happens to look like a vine, the other is a genuine tropical shrub with zero frost tolerance.

Passionflower Varieties at a Glance

A note on reading that table if you’re gardening in the UK: RHS hardiness ratings (H1-H7) and USDA zones aren’t the same scale and don’t convert cleanly. USDA zones are built purely on average annual minimum temperature; RHS ratings factor in the UK’s milder, wetter winters and shorter cold snaps, so a plant rated H4 (roughly USDA 8-9 territory) often performs more reliably in a UK garden than the raw temperature conversion suggests. Where a variety above has both ratings listed — P. caerulea is the clearest example — trust the RHS number if you’re gardening in the UK and the USDA number everywhere else, rather than trying to convert one to the other.

The Hardy Natives: Plant Once, Ignore the Winter

Passiflora incarnata (maypop) is the variety worth defaulting to if you garden anywhere colder than zone 8 and still want passionflower’s signature fringed bloom. It’s a genuine US native — ranging across the southeastern and central states — and its lateral roots produce adventitious buds that push up new shoots feet away from the visible vine, entirely independent of what’s growing above ground [1]. That root behavior is also why cutting back the vine does nothing to control spread; only container growing (3-5 gallon pots) or a physical below-ground root barrier interrupts the actual spreading mechanism.

Worth clarifying before you plant it: “aggressive” and “invasive” aren’t the same claim. P. incarnata spreads readily in a bed (aggressive), but as a US native species it isn’t ecologically invasive by definition — a distinction a lot of general gardening content blurs for this plant specifically. It’s also the only larval host, along with P. lutea and P. suberosa, that Gulf Fritillary caterpillars can actually digest; eggs laid on ornamental tropical hybrids hatch, but the caterpillars starve [1].

Passiflora lutea (yellow passionflower) is the quieter native option, and the one most competing variety round-ups skip entirely. NC State Extension rates it hardy across USDA 5a-10b — slightly wider than maypop’s range — and unlike its showier cousin, it actually prefers bright shade to partial sun, thriving along woodland edges and streambanks where full-sun vines struggle [5]. The trade-off is scale: flowers run under an inch across in a pale greenish-yellow, nothing like maypop’s dramatic fringe, and most gardeners grow it for wildlife value (it hosts the same three Gulf Fritillary-compatible species) rather than ornamental impact. If you have a shaded fence line where sun-loving vines fail, it’s the native passionflower built for that exact spot.

The Semi-Hardy Bridge: Bigger Blooms, a Real Frost Risk

Passiflora caerulea (blue passionflower) splits the difference between native toughness and tropical flower size. RHS rates it H4 — hardy to roughly 14-23°F — and it holds a semi-evergreen woody framework through mild winters rather than dying back completely [3]. That’s the catch: unlike maypop, there’s no root-crown reset if a hard freeze pushes past its threshold. In marginal zones (7b-8), treat it as a plant that might come back from the root even if the top freezes, but don’t count on it the way you would with a true herbaceous native.

Passiflora ‘Incense’ is the hybrid built specifically to solve that gap. It’s a cross between the hardy native P. incarnata and the tropical P. cincinnata, engineered to combine the native parent’s cold tolerance with the tropical parent’s dramatically larger, fragrant blooms — 4-5 inches across in deep violet, versus maypop’s 2-3 inches [10]. Root-hardy to roughly zone 6/7, it dies to the ground with winter protection in colder zones and re-sprouts reliably from the root, closer to maypop’s survival strategy than caerulea’s. If you want a hardy-native-adjacent plant with genuinely showier flowers than P. incarnata, this is the one to look for — nurseries specializing in hardy Passiflora hybrids are a more reliable source than big-box centers, which rarely stock it.

The Tender Tropicals Grown for Fruit

Passiflora edulis (purple passion fruit) and its yellow-fruited form P. edulis f. flavicarpa are what most people picture when they think “passion fruit,” and both are strictly USDA 9b-11 plants with no hardy backup — damage starts below roughly 30°F [6]. The practical difference between the two forms matters more than most variety lists let on: the purple form is self-fertile, so a single vine can set fruit on its own, while the yellow form is self-incompatible and needs a genetically distinct second plant nearby — two cuttings taken from the same parent vine are still the same individual and won’t cross-pollinate each other [7]. If you only have room for one vine and want fruit, the purple form is the lower-risk choice for that reason alone.

Both forms also carry a juvenile phase that catches new growers off guard: seed-grown vines can spend 12 to 36 months in purely vegetative growth before they flower at all, while cutting-grown plants inherit the parent’s physiological maturity and can flower in their first year [7]. If you’re buying for fruit production on a timeline, ask specifically whether the plant was grown from seed or cutting — it’s a bigger factor in when you’ll see flowers than soil, sun, or fertilizer. For trellis specs, hand-pollination technique, and a full pruning calendar for fruiting vines, see our passion fruit vine growing guide.

The Hummingbird Specialists

Passiflora citrina (lemon passionflower) is a genuine oddity in the genus: specialty growers describe it as the only yellow-flowered Passiflora pollinated by hummingbirds rather than bees or butterflies, a trait tied to its narrow, tubular flower shape rather than the flat, open form most passionflowers use [13]. Native to a small range in Guatemala and Honduras, where botanist John MacDougal first documented it in 1989 [13][9], it’s a tender USDA zone 9 plant — Digging Dog Nursery notes it needs night temperatures above 25°F to keep flowering continuously [13] — best grown in a container that can move indoors, where its compact, near-continuous yellow blooms make it one of the better options for a patio hummingbird setup.

Passiflora vitifolia (scarlet flame passionflower) takes the hummingbird angle further with large, 4-5 inch scarlet-red blooms — red being the color hummingbirds key in on most strongly across plant species generally. It’s native to Costa Rica through northwestern South America and rated for USDA zones 10-11 by Chicago Botanic Garden, with no meaningful cold tolerance; the garden’s own growing notes specify it needs a warm, humid greenhouse to thrive outside a true tropical climate [8]. Its leaves also double as a food source for Heliconius butterfly larvae, so a vitifolia planting can support both hummingbirds and a second pollinator group at once [8].

Ornamental Hybrids Built for Containers

Passiflora ‘Lady Margaret’ is a cross between P. coccinea and P. incarnata, bred for a striking raspberry-red flower with a bright white center rather than for fruit or fragrance [11]. It stays compact — 2-3 feet in a container, a genuinely manageable size compared to the 15-30 foot vines most tropical Passiflora put on — which makes it one of the few varieties suited to a patio pot rather than a permanent trellis or arbor. Logee’s, a specialty nursery that sells the hybrid, rates it for USDA zone 10 [11]; some growers report overwintering it in sheltered zone 8-9 spots with heavy mulch, but treat that as anecdotal grower experience rather than a documented hardiness rating. In colder zones, grow it in a container and bring it in before frost; it blooms nearly year-round indoors with enough light.

Choosing the Right Variety for Your Garden

Match the variety to what you actually want from it, not just to the prettiest photo on the plant tag:

• Cold climate, zone 5-7, want it to survive without intervention: P. incarnata (sun) or P. lutea (shade)
• Cold climate but want bigger, showier blooms than the straight native: P. ‘Incense’
• Mild-winter zone 8-10, want a permanent ornamental vine: P. caerulea
• Want to eat what you grow: P. edulis (one vine, self-fertile) or the yellow form if you can fit two genetically distinct plants
• Hummingbird garden, warm climate or container-mobile: P. citrina or P. vitifolia
• Patio pot or hanging basket, compact size: P. ‘Lady Margaret’

Whichever variety you land on, all of them climb by tendril and need real support rather than a stake — a sturdy trellis like the Gardener’s Supply Titan A-Frame Trellis gives the vigorous tropical varieties enough structure to climb without collapsing under mature growth. And if you’re growing a tender tropical variety in a marginal zone and get caught by a surprise cold snap before you’ve moved it indoors, a floating row cover like Agfabric’s frost blanket buys several degrees of protection overnight — it won’t save a plant from a hard freeze, but it can be the difference between minor leaf damage and losing the vine outright.

Is Any Passionflower Variety Actually Invasive?

Only in the sense that vigorous spread and “invasive” get conflated. P. incarnata is a US native and can’t be ecologically invasive by definition, even though its root-sucker spread makes it feel that way in a small bed. The tropical ornamental and fruiting varieties covered here — caerulea, edulis, citrina, vitifolia, and the hybrids — don’t have the same aggressive root-sucker mechanism at all; their spread risk, where it exists, is via self-seeding in frost-free climates rather than underground runners. If a specific variety is documented as regionally invasive in your state (check your local extension service or state invasive-species list before planting anything tropical outdoors year-round), that’s a location-specific finding, not a genus-wide pattern.

Frequently Asked Questions

Which passionflower variety is the hardiest?
Passiflora incarnata (maypop), surviving USDA zone 5 to -20°F, with P. lutea close behind at zone 5a. Both survive by dying back to the root crown each winter, not by cold-tolerant stems.

Can I grow a tropical Passiflora variety outdoors in a cold climate?
Only as a container plant you bring indoors before frost, or as an annual you accept losing each winter. True tropical species like P. edulis, P. citrina, and P. vitifolia have no root-hardy backup mechanism the way native species do.

Do all passionflower varieties produce edible fruit?
No. P. edulis and its yellow form are grown specifically for fruit. P. incarnata produces a smaller, edible maypop fruit. Ornamental hybrids like ‘Lady Margaret’ and species like P. citrina and P. vitifolia are bred or selected for flower display, not fruit quality.

What’s the difference between purple and yellow passion fruit vines?
The purple form (P. edulis) is self-fertile and can fruit alone. The yellow form (P. edulis f. flavicarpa) is self-incompatible and needs a genetically distinct second vine nearby to set fruit.

Is passionflower toxic to pets?
Sources vary by which claim they’re testing. See our passionflower growing guide for the full ASPCA-versus-extension toxicity breakdown specific to P. incarnata.

Key Takeaways

• “Hardy” and “tropical” passionflower survive winter through completely different mechanisms — root-crown regrowth versus no cold tolerance at all — so match the variety to your zone before anything else
• P. incarnata and P. lutea are the only two US-native, truly cold-hardy options; everything else needs either a mild winter, a container, or an accepted annual loss
• Purple passion fruit (P. edulis) is self-fertile; the yellow form needs a second, genetically distinct vine to set fruit
• P. citrina and P. vitifolia are hummingbird specialists worth growing specifically for that pollinator, not for fruit or fragrance
• Vigorous spread in a native species like maypop is not the same claim as ecological invasiveness — check your state’s actual invasive list before assuming either way

Sources

• NC State Extension Gardener Plant Toolbox — Passiflora incarnata: plants.ces.ncsu.edu/plants/passiflora-incarnata/
• RHS Growing Guide — Passion flower: rhs.org.uk/plants/passion-flower/growing-guide
• RHS — Passiflora caerulea: rhs.org.uk/plants/12356/passiflora-caerulea/details
• Missouri Botanical Garden Plant Finder — Passiflora incarnata: missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=q280
• NC State Extension Gardener Plant Toolbox — Passiflora lutea: plants.ces.ncsu.edu/plants/passiflora-lutea/
• UF/IFAS Extension HS1406 — Passion Fruit Growing in the Florida Home Landscape: ask.ifas.ufl.edu/publication/HS1406
• UF/IFAS Extension HS1467: ask.ifas.ufl.edu/publication/HS1467
• Chicago Botanic Garden Plant Finder — Passiflora vitifolia: chicagobotanic.org/plant-information/plant-finder/passiflora-vitifolia-crimson-passionflower
• RHS — Passiflora citrina: rhs.org.uk/plants/70943/passiflora-citrina-calzoncillo-(honduras)-molo-(guatemala)/details
• Woodlanders Nursery — Passiflora ‘Incense’: woodlanders.net/products/passiflora-incarnata-x-cincinnata-incense
• Logee’s — Passion Flower ‘Lady Margaret’: logees.com/passion-flower-lady-margaret-passiflora-hybrid.html
• Missouri Botanical Garden Plant Finder — Passiflora edulis: missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=284893
• Digging Dog Nursery — Passiflora citrina: diggingdog.com/plant/T-0282