Fertilising guide
How to fertilise Red Passion Flower (Passiflora coccinea)— schedule & NPK
Also called Scarlet Passion Flower, Red Granadilla, Red Passionfruit.
More about red passion flower
About Red Passion Flower
Passiflora coccinea · also called Scarlet Passion Flower, Red Granadilla · flowering
Passiflora coccinea is a tropical climbing passion flower native to northern South America, producing vivid scarlet-red flowers and edible yellow-orange fruits. It is a fast-growing vine requiring warmth, high humidity, and full sun. Best suited to heated glasshouses or tropical gardens. Toxic to pets — contains cyanogenic compounds similar to other Passiflora.
Growth habit: Vigorous evergreen tendril-climbing tropical vine
What fertiliser red passion flower actually wants — and why
Red Passion Flower 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 red passion flower: 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 red passion flower, 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 red passion flower:
Feed with a high-potassium liquid fertiliser (tomato feed or equivalent) every 2 weeks during active growth from spring through summer. Supplement with a balanced fertiliser monthly to support vigorous tropical growth. Reduce to nil in winter. Treat that as every 2 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 red passion flower 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 red passion flower
Half strength is the safe default for red passion flower — 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 red passion flower first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the red passion flower watering schedule.
Signs you are over-feeding red passion flower
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for red passion flower:
- 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 red passion flower
- 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 red passion flower care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of red passion flower 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 red passion flower
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 red passion flower — frequently asked questions
What fertiliser does red passion flower 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. Red Passion Flower 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 red passion flower?
Feed with a high-potassium liquid fertiliser (tomato feed or equivalent) every 2 weeks during active growth from spring through summer. Supplement with a balanced fertiliser monthly to support vigorous tropical growth. Reduce to nil in winter. Feed with a high-potassium liquid fertiliser (tomato feed or equivalent) every 2 weeks during active growth from spring through summer. Supplement with a balanced fertiliser monthly to support vigorous tropical growth. Reduce to nil in winter. Treat that as every 2 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 red passion flower?
Half strength is the safe default for red passion flower — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding red passion flower 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 red passion flower 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 red passion flower?
Flush the pot of red passion flower 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
- Red Passion Flower care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water red passion flower — 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 eastern everlasting
- How to fertilise hound's-tongue
- How to fertilise common spotted orchid
- All 11687 fertilising guides in the Growli library