Fertilising guide
How to fertilise White Passionflower (Passiflora caerulea 'Constance Elliott')— schedule & NPK
Also called White Passionflower, Constance Elliott Passionflower, White Blue Passion Flower.
More about white passionflower
About White Passionflower
Passiflora caerulea 'Constance Elliott' · also called White Passionflower, Constance Elliott Passionflower · flowering
Passiflora caerulea 'Constance Elliott' is a vigorous, fragrant white-flowered cultivar of the blue passionflower, awarded the RHS Award of Garden Merit. Hardy enough to overwinter outdoors in much of the UK with root protection, it produces a succession of ivory blooms through summer followed by orange fruits. Ideal for a sheltered sunny wall.
Growth habit: Vigorous semi-evergreen to deciduous twining climber; top growth may die back in hard winters but roots usually survive and resprout
What fertiliser white passionflower actually wants — and why
White Passionflower 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 white passionflower: 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 white passionflower, 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 white passionflower:
Apply a balanced granular fertiliser in spring as growth starts. Avoid high nitrogen in summer which promotes leafy growth over flowers. A potassium-rich tomato fertiliser applied fortnightly from early summer improves flowering and fruiting. Treat that as sparingly through the growing season 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 white passionflower 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 white passionflower
Half strength is the safe default for white passionflower — 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 white passionflower first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the white passionflower watering schedule.
Signs you are over-feeding white passionflower
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for white passionflower:
- 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 white passionflower
- 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 white passionflower care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of white passionflower 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 white passionflower
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 white passionflower — frequently asked questions
What fertiliser does white passionflower 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. White Passionflower 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 white passionflower?
Apply a balanced granular fertiliser in spring as growth starts. Avoid high nitrogen in summer which promotes leafy growth over flowers. A potassium-rich tomato fertiliser applied fortnightly from early summer improves flowering and fruiting. Apply a balanced granular fertiliser in spring as growth starts. Avoid high nitrogen in summer which promotes leafy growth over flowers. A potassium-rich tomato fertiliser applied fortnightly from early summer improves flowering and fruiting. Treat that as sparingly through the growing season 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 white passionflower?
Half strength is the safe default for white passionflower — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding white passionflower 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 white passionflower 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 white passionflower?
Flush the pot of white passionflower 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
- White Passionflower care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water white passionflower — 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 sinomiyama toad lily
- How to fertilise britt-marie crawford ligularia
- How to fertilise desdemona ligularia
- All 8452 fertilising guides in the Growli library