Fertilising guide
How to fertilise Passiflora coccinea (Passiflora coccinea)— schedule & NPK
Also called red passionflower, scarlet passionflower.
More about passiflora coccinea
About Passiflora coccinea
Passiflora coccinea · also called red passionflower, scarlet passionflower · tropical
Passiflora coccinea is a vigorous tropical climbing vine prized for vivid scarlet, fringed flowers borne through the warm months. Native to South America, it climbs by tendrils and needs sturdy support, ample warmth and high humidity. In cool climates it is grown under glass or as a conservatory specimen, flowering best in bright, frost-free conditions with steady moisture.
Growth habit: Evergreen tendril-climbing vine, fast-growing and scrambling, clinging to trellis, wires or netting; benefits from tying-in and seasonal thinning.
Watch for — Few or no flowers: Usually too little light or excess nitrogen; move to brighter conditions and switch to a high-potash feed.
What fertiliser passiflora coccinea actually wants — and why
Passiflora coccinea 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 coccinea: 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 coccinea, 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 coccinea:
Feed every 2-4 weeks through spring and summer with a balanced or high-potash liquid fertiliser to support flowering; avoid heavy nitrogen, which drives leafy growth at the expense of blooms. Stop feeding in autumn and winter. Treat that as every 2-4 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 coccinea 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 coccinea
Half strength is the safe default for passiflora coccinea — 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 coccinea first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the passiflora coccinea watering schedule.
Signs you are over-feeding passiflora coccinea
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for passiflora coccinea:
- 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 coccinea
- 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 coccinea care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of passiflora coccinea 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 coccinea
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 coccinea — frequently asked questions
What fertiliser does passiflora coccinea 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 coccinea 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 coccinea?
Feed every 2-4 weeks through spring and summer with a balanced or high-potash liquid fertiliser to support flowering; avoid heavy nitrogen, which drives leafy growth at the expense of blooms. Stop feeding in autumn and winter. Feed every 2-4 weeks through spring and summer with a balanced or high-potash liquid fertiliser to support flowering; avoid heavy nitrogen, which drives leafy growth at the expense of blooms. Stop feeding in autumn and winter. Treat that as every 2-4 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 coccinea?
Half strength is the safe default for passiflora coccinea — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding passiflora coccinea 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 coccinea 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 coccinea?
Flush the pot of passiflora coccinea 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 coccinea care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water passiflora coccinea — 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