Fertilising guide
How to fertilise Herald Trumpet Vine (Beaumontia grandiflora)— schedule & NPK
Also called Easter Lily Vine, Nepal Trumpet Flower, White Herald Trumpet.
More about herald trumpet vine
About Herald Trumpet Vine
Beaumontia grandiflora · also called Easter Lily Vine, Nepal Trumpet Flower · tropical
Herald Trumpet Vine is a spectacular evergreen climber from the Himalayas and India, grown for its large, fragrant white trumpet flowers up to 12 cm long produced in spring. A vigorous grower requiring substantial support, it is best suited to warm frost-free climates or a large heated conservatory. Treat as toxic given its Apocynaceae family membership.
Growth habit: Very vigorous evergreen woody twining climber
What fertiliser herald trumpet vine actually wants — and why
Herald Trumpet Vine 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 herald trumpet vine: 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 herald trumpet vine, 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 herald trumpet vine:
Feed monthly with a balanced fertiliser from late winter through summer. Apply a high-potassium, low-nitrogen feed from midsummer onwards to mature the wood and promote flowering the following spring. Treat that as monthly 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 herald trumpet vine 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 herald trumpet vine
Half strength is the safe default for herald trumpet vine — 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 herald trumpet vine first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the herald trumpet vine watering schedule.
Signs you are over-feeding herald trumpet vine
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for herald trumpet vine:
- 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 herald trumpet vine
- 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 herald trumpet vine care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of herald trumpet vine 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 herald trumpet vine
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 herald trumpet vine — frequently asked questions
What fertiliser does herald trumpet vine 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. Herald Trumpet Vine 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 herald trumpet vine?
Feed monthly with a balanced fertiliser from late winter through summer. Apply a high-potassium, low-nitrogen feed from midsummer onwards to mature the wood and promote flowering the following spring. Feed monthly with a balanced fertiliser from late winter through summer. Apply a high-potassium, low-nitrogen feed from midsummer onwards to mature the wood and promote flowering the following spring. Treat that as monthly 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 herald trumpet vine?
Half strength is the safe default for herald trumpet vine — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding herald trumpet vine 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 herald trumpet vine 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 herald trumpet vine?
Flush the pot of herald trumpet vine 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
- Herald Trumpet Vine care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water herald trumpet vine — 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 asian wonder bamboo
- How to fertilise narrow-leaf fountain bamboo
- How to fertilise common bamboo
- All 11687 fertilising guides in the Growli library