Passiflora 'Incense' (Incense Passionflower) care

Light

Most houseplants will scorch where passiflora 'incense' thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun to light shade gives the best flowering and fragrance; aim for at least six hours of direct sun. Indoors, a bright south or west window is essential. Too little light yields lush vines but few blooms. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for when the top 2-3 cm of soil is dry, every 3-5 days in summer heat for passiflora 'incense', but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Keep consistently moist during the growing and flowering season, as this vigorous vine transpires heavily. Do not let it dry out when budding or flowers may drop. Reduce watering in winter, especially if grown cool under glass.

Soil and pot

Passiflora 'Incense' grows best in fertile, well-drained loam. Plant in moisture-retentive but free-draining soil enriched with compost. In containers use a loam-based mix such as John Innes No.3 with added grit. It dislikes waterlogged roots, so ensure drainage. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Passiflora 'Incense' sits happiest at around 40-60% humidity and 10-27°C (50-80°F). Tolerant of average outdoor and indoor humidity. Outdoors in summer it needs no special attention; under glass, ventilate to prevent stagnant damp air that invites fungal problems and red spider mite. If you keep the room above 10 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed passiflora 'incense' sparingly. Feed every 2-3 weeks in the growing season with a high-potash fertiliser (such as a tomato feed) to encourage flowering rather than leaf. Avoid high-nitrogen feeds, which promote foliage at the expense of blooms. Stop feeding in autumn. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on passiflora 'incense' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Few or no flowers — Usually too little sun or too much nitrogen. Move to full sun and switch to a high-potash feed to trigger blooming.
• Bud drop — Caused by irregular watering or sudden temperature swings. Keep soil evenly moist and conditions stable while in bud.
• Red spider mite — Common under glass in hot, dry air, causing fine webbing and mottled leaves. Improve airflow, raise humidity, and treat early.
• Yellowing lower leaves — Can indicate overwatering, poor drainage, or nutrient deficiency. Check drainage and feed during the growing season.

Propagation

Propagate from semi-ripe stem cuttings in summer, rooted in a free-draining mix with bottom heat and high humidity. As a named hybrid it does not come true from seed, so cuttings are the reliable method. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Passiflora 'Incense' is mildly toxic to pets. Passiflora is not listed on the ASPCA toxic plant database, but it is not confirmed pet-safe either; the leaves and stems of many passionflowers contain cyanogenic glycosides that can cause stomach upset, drooling, or lethargy if eaten. Treat with caution and verify with a vet; prevent pets from chewing the foliage. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Passiflora 'Incense' deep-dive guides

Every aspect of passiflora 'incense' care, each with its own calibrated guide:

• Passiflora 'Incense' watering schedule
• Passiflora 'Incense' light requirements
• Best soil mix for passiflora 'incense'
• Passiflora 'Incense' fertilizing guide
• When to repot passiflora 'incense'
• How to propagate passiflora 'incense'
• Passiflora 'Incense' growth rate & size
• Passiflora 'Incense' cold hardiness
• Passiflora 'Incense' temperature & humidity
• Is passiflora 'incense' toxic to cats & dogs?
• Is passiflora 'incense' toxic to cats?
• Is passiflora 'incense' toxic to dogs?
• Getting passiflora 'incense' to bloom

Featured in these plant shortlists

Passiflora 'Incense' qualifies for 6 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best trailing & climbing houseplants — Vining and trailing houseplants for shelves, hanging pots, and moss poles — selected by growth habit.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Best fast-growing houseplants — Houseplants documented as fast or vigorous growers — quick to fill a pot, cover a pole or trail down a shelf.
• Best fragrant houseplants — Indoor plants with scented flowers or aromatic foliage — greenery you can smell, selected from our care library.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Passiflora 'Incense' is also commonly called Incense Passionflower or Fragrant Passionflower.

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