Fertilising guide
How to fertilise Yellow Trumpet Creeper (Campsis radicans 'Flava')— schedule & NPK
Also called Yellow Trumpet Creeper, Yellow Trumpet Vine, Flava Trumpet Vine.
More about yellow trumpet creeper
About Yellow Trumpet Creeper
Campsis radicans 'Flava' · also called Yellow Trumpet Creeper, Yellow Trumpet Vine · flowering
A vigorous, deciduous climbing vine bearing clusters of soft yellow trumpet-shaped flowers in summer. Attaches via aerial rootlets and tolerates heat, drought, and poor soils once established. Attracts hummingbirds and butterflies. Fast-growing and tough, but needs firm support and regular pruning to prevent it taking over surrounding plants.
Growth habit: Vigorous deciduous woody climber; attaches via aerial rootlets
What fertiliser yellow trumpet creeper actually wants — and why
Yellow Trumpet Creeper 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 yellow trumpet creeper: 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 yellow trumpet creeper, 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 yellow trumpet creeper:
Apply a low-nitrogen, high-potassium fertiliser (e.g. tomato feed) once in spring. Avoid high-nitrogen feeds, which encourage foliage over flowers. Established plants in decent soil rarely need supplemental feeding. 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 yellow trumpet creeper 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 yellow trumpet creeper
Half strength is the safe default for yellow trumpet creeper — 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 yellow trumpet creeper first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the yellow trumpet creeper watering schedule.
Signs you are over-feeding yellow trumpet creeper
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for yellow trumpet creeper:
- 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 yellow trumpet creeper
- 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 yellow trumpet creeper care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of yellow trumpet creeper 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 yellow trumpet creeper
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 yellow trumpet creeper — frequently asked questions
What fertiliser does yellow trumpet creeper 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. Yellow Trumpet Creeper 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 yellow trumpet creeper?
Apply a low-nitrogen, high-potassium fertiliser (e.g. tomato feed) once in spring. Avoid high-nitrogen feeds, which encourage foliage over flowers. Established plants in decent soil rarely need supplemental feeding. Apply a low-nitrogen, high-potassium fertiliser (e.g. tomato feed) once in spring. Avoid high-nitrogen feeds, which encourage foliage over flowers. Established plants in decent soil rarely need supplemental feeding. 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 yellow trumpet creeper?
Half strength is the safe default for yellow trumpet creeper — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding yellow trumpet creeper 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 yellow trumpet creeper 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 yellow trumpet creeper?
Flush the pot of yellow trumpet creeper 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
- Yellow Trumpet Creeper care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water yellow trumpet creeper — 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 black-eyed susan
- How to fertilise rudbeckia maxima
- How to fertilise echinacea 'magnus'
- All 8452 fertilising guides in the Growli library