Fertilising guide

How to fertilise Banana passionfruit (Passiflora antioquiensis)— schedule & NPK

Also called Banana passionfruit, Red banana passion flower, Curuba de Castilla.

More about banana passionfruit

About Banana passionfruit

Passiflora antioquiensis · also called Banana passionfruit, Red banana passion flower · flowering

Banana passionfruit is a spectacular high-altitude Colombian climber producing pendulous, deep rose-pink flowers up to 12 cm across, followed by elongated yellow-orange fruit with edible pulp. Unlike most passionflowers, it thrives in cool montane conditions. Ideal for temperate greenhouses or mild coastal gardens, it attracts hummingbirds in its native range.

Growth habit: Vigorous twining climber with softly hairy stems; needs a robust trellis or pergola.

Watch for — Red spider mite: Warm, dry air encourages infestations visible as fine webbing and pale mottling. Raise humidity, remove heavily infested leaves, and apply predatory mites (Phytoseiulus persimilis) or neem oil.

What fertiliser banana passionfruit actually wants — and why

Banana passionfruit flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.

Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency.

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 banana passionfruit: 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 banana passionfruit, 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 banana passionfruit:

The dormant-season rule matters more than the exact interval: skip feeding entirely when banana passionfruit 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 banana passionfruit

None is the correct answer for banana passionfruit. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.

Feeding always goes onto already-damp soil, never dry roots — water banana passionfruit first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the banana passionfruit watering schedule.

Signs you are over-feeding banana passionfruit

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for banana passionfruit:

Abundant leafy growth and very few flowers (the classic over-rich symptom).
Soft, floppy stems and a sprawling, leafy habit.
Scorched edges and salt crust if it has been fed in a container.

Signs you are under-feeding banana passionfruit

Effectively never an issue — these plants flower on poverty.
Only on genuinely dead soil: weak, thin growth and few blooms.
A short-lived plant in completely spent container compost.

If the symptoms point at watering, light or roots rather than nutrition, the full banana passionfruit care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

If banana passionfruit has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.

Organic vs synthetic feeds for banana passionfruit

Organic options

A thin compost mulch for soil structure is the absolute most; mostly, give it nothing. UK/US: leave it lean — no manure, no liquid feed. Poor soil is the active ingredient here.

Synthetic / liquid feeds

None. Synthetic feeds, particularly anything with appreciable nitrogen, directly suppress flowering in banana passionfruit.

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 banana passionfruit — frequently asked questions

What fertiliser does banana passionfruit need?

Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency. Banana passionfruit flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.

How often should I feed banana passionfruit?

Apply a balanced liquid fertiliser every 2–3 weeks during the growing season (spring to autumn). A high-potassium feed encourages the large blooms. Reduce to monthly in winter. Avoid high-nitrogen feeds that promote leafy growth at the expense of flowers. Apply a balanced liquid fertiliser every 2–3 weeks during the growing season (spring to autumn). A high-potassium feed encourages the large blooms. Reduce to monthly in winter. Avoid high-nitrogen feeds that promote leafy growth at the expense of flowers. In practice: no routine feeding at all for banana passionfruit — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for banana passionfruit?