Fertilising guide
How to fertilise Angel's Trumpet (Brugmansia suaveolens)— schedule & NPK
Also called Angel's trumpet, Snowy angel's trumpet, Angel's tears.
More about angel's trumpet
About Angel's Trumpet
Brugmansia suaveolens · also called Angel's trumpet, Snowy angel's trumpet · flowering
Angel's trumpet is a fast-growing tropical shrub or small tree prized for huge, pendulous, intensely fragrant trumpet flowers. Give it full sun, rich moist soil, generous feeding, and protection below 10C. Every part is highly poisonous (tropane alkaloids), so the ASPCA and Pet Poison Helpline rate it toxic to pets and people.
Growth habit: Fast-growing, woody-stemmed evergreen shrub or small tree with a spreading, multi-branched canopy; branches characteristically fork (dichotomously) above which flowering begins. Flowers are large, pendulous, trumpet-shaped, and powerfully fragrant — especially in the evening.
Watch for — Failure to flower: Blooms appear only after stems fork into the characteristic Y branching, which needs maturity. Too little sun, too little feed, or over-potting delays flowering — give full sun and regular high-potassium feed.
What fertiliser angel's trumpet actually wants — and why
Angel's Trumpet 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 angel's trumpet: 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 angel's trumpet, 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 angel's trumpet:
Heavy feeder. During active growth feed every 1-2 weeks with a balanced or bloom-boosting (higher potassium/phosphorus) liquid fertiliser; water-soluble feeds at full strength suit established container plants. Stop feeding in autumn before dormancy. Treat that as every 1-2 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 angel's trumpet 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 angel's trumpet
Half strength is the safe default for angel's trumpet — 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 angel's trumpet first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the angel's trumpet watering schedule.
Signs you are over-feeding angel's trumpet
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for angel's trumpet:
- 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 angel's trumpet
- 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 angel's trumpet care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of angel's trumpet 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 angel's trumpet
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 angel's trumpet — frequently asked questions
What fertiliser does angel's trumpet 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. Angel's Trumpet 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 angel's trumpet?
Heavy feeder. During active growth feed every 1-2 weeks with a balanced or bloom-boosting (higher potassium/phosphorus) liquid fertiliser; water-soluble feeds at full strength suit established container plants. Stop feeding in autumn before dormancy. Heavy feeder. During active growth feed every 1-2 weeks with a balanced or bloom-boosting (higher potassium/phosphorus) liquid fertiliser; water-soluble feeds at full strength suit established container plants. Stop feeding in autumn before dormancy. Treat that as every 1-2 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 angel's trumpet?
Half strength is the safe default for angel's trumpet — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding angel's trumpet 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 angel's trumpet 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 angel's trumpet?
Flush the pot of angel's trumpet 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
- Angel's Trumpet care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water angel's trumpet — 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 peace lily
- How to fertilise bird of paradise
- How to fertilise hoya
- All 609 fertilising guides in the Growli library