Fertilising guide
How to fertilise Persian Lily (Fritillaria persica)— schedule & NPK
Also called Persian Lily, Persian Fritillary, Persia Bellflower.
More about persian lily
About Persian Lily
Fritillaria persica · also called Persian Lily, Persian Fritillary · flowering
Fritillaria persica is a stately Middle Eastern bulb producing tall, slender spikes of up to 30 pendant, plum-purple to charcoal bells on grey-green glaucous foliage in mid-spring. Its dramatic colouring makes it a standout in dry gravel gardens and warm borders. Toxic to dogs and cats due to alkaloids typical of the Fritillaria genus.
Growth habit: Tall bulbous perennial; upright with pendulous bells
What fertiliser persian lily actually wants — and why
Persian Lily feeds for next year, not this one — the critical window is after flowering, while the leaves are still green and recharging the bulb.
A low-nitrogen, potassium- and phosphorus-leaning bulb fertiliser (something like 5-10-10) or bonemeal at planting. High nitrogen grows floppy leaves and rots stored bulbs.
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 persian lily: 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 persian lily, 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 persian lily:
Apply a balanced bulb fertiliser (low nitrogen) at planting in autumn and lightly again as shoots emerge in spring. Potassium-rich feeds after flowering support good bulb ripening. Avoid high-nitrogen applications which can compromise next year's flower formation. The rhythm: a bulb feed at planting, a light feed as leaves emerge, and — most important — a potassium feed straight after flowering while the foliage is still green and feeding the bulb. Never cut the leaves off early.
The dormant-season rule matters more than the exact interval: skip feeding entirely when persian lily 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 persian lily
Use the bulb-feed label rate for persian lily; the timing (post-bloom, leaves still green) does far more for next year's display than the concentration.
Feeding always goes onto already-damp soil, never dry roots — water persian lily first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the persian lily watering schedule.
Signs you are over-feeding persian lily
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for persian lily:
- Tall, floppy, soft leaves that flop over (too much nitrogen).
- Soft or rotting bulbs lifted at the end of the season.
- Lush foliage but few or poor flowers.
Signs you are under-feeding persian lily
- Progressively fewer or smaller flowers year on year ("going blind").
- Small, weak bulbs and thin foliage.
- Bulbs that fail to come back at all after a few seasons.
If the symptoms point at watering, light or roots rather than nutrition, the full persian lily care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Bulbs are not container-flushed like houseplants; the equivalent is not over-feeding and lifting/dividing congested clumps of persian lily every few years so they are not competing for nutrients.
Organic vs synthetic feeds for persian lily
Organic options
Bonemeal worked in at planting plus a mulch of garden compost or well-rotted leaf-mould is the traditional, reliable approach for persian lily. UK: blood, fish & bone or Westland Bulb Food; US: Espoma Bulb-tone or bonemeal.
Synthetic / liquid feeds
A proprietary bulb fertiliser at planting and a high-potash liquid (tomato feed) after flowering — UK: Westland Bulb Food then Tomorite; US: Miracle-Gro Shake 'n Feed Bulb or a bloom booster post-flower.
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 persian lily — frequently asked questions
What fertiliser does persian lily need?
A low-nitrogen, potassium- and phosphorus-leaning bulb fertiliser (something like 5-10-10) or bonemeal at planting. High nitrogen grows floppy leaves and rots stored bulbs. Persian Lily feeds for next year, not this one — the critical window is after flowering, while the leaves are still green and recharging the bulb.
How often should I feed persian lily?
Apply a balanced bulb fertiliser (low nitrogen) at planting in autumn and lightly again as shoots emerge in spring. Potassium-rich feeds after flowering support good bulb ripening. Avoid high-nitrogen applications which can compromise next year's flower formation. Apply a balanced bulb fertiliser (low nitrogen) at planting in autumn and lightly again as shoots emerge in spring. Potassium-rich feeds after flowering support good bulb ripening. Avoid high-nitrogen applications which can compromise next year's flower formation. The rhythm: a bulb feed at planting, a light feed as leaves emerge, and — most important — a potassium feed straight after flowering while the foliage is still green and feeding the bulb. Never cut the leaves off early.
What strength of feed for persian lily?
Use the bulb-feed label rate for persian lily; the timing (post-bloom, leaves still green) does far more for next year's display than the concentration.
What does over-feeding persian lily look like?
Tall, floppy, soft leaves that flop over (too much nitrogen). Soft or rotting bulbs lifted at the end of the season. Lush foliage but few or poor flowers. Cutting or tying off the leaves of persian lily as soon as the flowers fade is the great bulb mistake — the bulb recharges through those leaves for weeks afterward, and removing them early means a weak or blind display next year.
Should I flush the soil of persian lily?
Bulbs are not container-flushed like houseplants; the equivalent is not over-feeding and lifting/dividing congested clumps of persian lily every few years so they are not competing for nutrients.
Keep reading
- Persian Lily care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water persian lily — 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 mayapple
- How to fertilise twinleaf
- How to fertilise celandine poppy
- All 11687 fertilising guides in the Growli library