Fertilising guide
How to fertilise Bishop's flower (Ammi majus)— schedule & NPK
Also called Bishop's flower, false Queen Anne's lace, laceflower, bullwort.
More about bishop's flower
About Bishop's flower
Ammi majus · also called Bishop's flower, false Queen Anne's lace · flowering
Bishop's flower is a tall, airy annual in the carrot family, bearing large flat-topped umbels of delicate white flowers beloved by florists and pollinators alike. It naturalises beautifully in cottage borders and cutting gardens, blooming from early summer into autumn. Sow in situ; it resents root disturbance and self-seeds prolifically.
Growth habit: Upright branching annual umbellifer
What fertiliser bishop's flower actually wants — and why
Bishop's flower 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 bishop's flower: 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 bishop's flower, 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 bishop's flower:
Incorporate a balanced granular fertiliser into the bed before sowing. On fertile soils, no further feeding is usually required. On poor soils, apply a balanced liquid feed monthly during the growing season. Avoid high nitrogen, which promotes leafy growth over flowers. 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 bishop's flower 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 bishop's flower
Half strength is the safe default for bishop's flower — 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 bishop's flower first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the bishop's flower watering schedule.
Signs you are over-feeding bishop's flower
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for bishop's flower:
- 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 bishop's flower
- 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 bishop's flower care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of bishop's flower 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 bishop's flower
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 bishop's flower — frequently asked questions
What fertiliser does bishop's flower 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. Bishop's flower 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 bishop's flower?
Incorporate a balanced granular fertiliser into the bed before sowing. On fertile soils, no further feeding is usually required. On poor soils, apply a balanced liquid feed monthly during the growing season. Avoid high nitrogen, which promotes leafy growth over flowers. Incorporate a balanced granular fertiliser into the bed before sowing. On fertile soils, no further feeding is usually required. On poor soils, apply a balanced liquid feed monthly during the growing season. Avoid high nitrogen, which promotes leafy growth over flowers. 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 bishop's flower?
Half strength is the safe default for bishop's flower — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding bishop's flower 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 bishop's flower 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 bishop's flower?
Flush the pot of bishop's flower 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
- Bishop's flower care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water bishop's flower — 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 siebold's magnolia
- How to fertilise yulan magnolia
- How to fertilise common rhododendron
- All 8452 fertilising guides in the Growli library