Fertilising guide
How to fertilise Passiflora alata (Passiflora alata)— schedule & NPK
Also called winged-stem passionflower, fragrant granadilla.
More about passiflora alata
About Passiflora alata
Passiflora alata · also called winged-stem passionflower, fragrant granadilla · tropical
Passiflora alata, the winged-stem passionflower, is a vigorous evergreen tropical vine from South America with conspicuously four-angled (winged) stems. It bears large, intensely fragrant crimson-and-purple flowers and edible orange fruit. Frost-tender and heat-loving, it is grown outdoors in tropical climates and as a heated-greenhouse or conservatory specimen elsewhere.
Growth habit: Vigorous evergreen tendril-climber with distinctive winged stems; flowers on new growth over a long warm season and benefits from regular pruning to stay in bounds.
Watch for — Shy flowering in low light or with excess nitrogen: Too little light or over-feeding with nitrogen gives lush foliage but few flowers; provide bright light and a high-potash feed to promote blooms.
What fertiliser passiflora alata actually wants — and why
Passiflora alata is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for passiflora alata: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed passiflora alata, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For passiflora alata:
Feed every 2-3 weeks through spring and summer with a balanced or high-potash liquid feed to sustain its vigorous growth and heavy flowering. Reduce feeding in the low light of winter. Treat that as every 2-3 weeks between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when passiflora alata is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for passiflora alata
Half strength is the safe default for passiflora alata — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water passiflora alata first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the passiflora alata watering schedule.
Signs you are over-feeding passiflora alata
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for passiflora alata:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding passiflora alata
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full passiflora alata care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of passiflora alata with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for passiflora alata
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising passiflora alata — frequently asked questions
What fertiliser does passiflora alata need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Passiflora alata is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed passiflora alata?
Feed every 2-3 weeks through spring and summer with a balanced or high-potash liquid feed to sustain its vigorous growth and heavy flowering. Reduce feeding in the low light of winter. Feed every 2-3 weeks through spring and summer with a balanced or high-potash liquid feed to sustain its vigorous growth and heavy flowering. Reduce feeding in the low light of winter. Treat that as every 2-3 weeks between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for passiflora alata?
Half strength is the safe default for passiflora alata — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding passiflora alata look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding passiflora alata year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of passiflora alata?
Flush the pot of passiflora alata with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Passiflora alata care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water passiflora alata — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise monstera
- How to fertilise pothos
- How to fertilise fiddle leaf fig
- All 3899 fertilising guides in the Growli library