Illustration
Red Passionflower
Passiflora coccinea
Red Passionflower blooms from July through September.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Red Passionflower
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 10–11. Expect it to reach about 13 ft tall and 5 ft wide at maturity, in roughly 3 years (not yet checked).
What was checked
Mature height and spread, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not, and each fact above says which. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Red Passionflower
Red Passionflower sits in a nearly frost-free range (zones 10 to 11): plant it in the cool season, fall through late winter, and let the mild months settle its roots. On the calendar that means October or November, or January or February. Once settled, it blooms from July to September.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 10, the middle of this plant's hardy range, start with zone 10 in January. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Red Passionflower get?
13 fttall5 ft 7 inan adult5 ftwideSee Red Passionflower in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Red Passionflower
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Red Passionflower about 5 ft apart, center to center, so each plant has room to reach its full width.
Add Red Passionflower to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Red Passionflower's height, spread, hardiness zones, sun and trait tags were checked against 11 published sources on July 29, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- hillcountrywatergardens.comHill Country Water Gardens and Nurseryheight, spread, hardiness zones, sun and trait tags
- Missouri Botanical Gardenheight, spread, hardiness zones, sun and trait tags
- fast-growing-trees.comFast Growing Treesheight, hardiness zones, sun and trait tags
- toptropicals.comTop Tropicalsheight, hardiness zones, sun and trait tags
- gardensonline.com.auGardensOnline (Australia)height, spread and sun
- greenleafnursery.comGreenleaf Nursery Companyheight, spread and hardiness zones
- plantvine.comPlantVineheight, hardiness zones and sun
- ladybirdnursery.com.auLadybird Nursery (Australia)sun and trait tags
- tropical.theferns.infoUseful Tropical Plants (tropical.theferns.info)height and trait tags
- hortuscamden.comHortus Camden (Camden Park historic plant database, Australia)height
- nparks.gov.sgNParks Flora and Fauna Web (National Parks Board, Singapore)sun
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Red Passionflower
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Leaves, stems and unripe fruit hold cyanogenic glycosides, a medium-severity poison; eating them can cause nausea, vomiting, drowsiness and irregular heartbeat. Ripe fruit is safe. per NC State
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.