Fertilising guide

How to fertilise Autumn Daffodil (Sternbergia lutea)— schedule & NPK

Also called Autumn daffodil, Winter daffodil, Lily-of-the-field, Yellow autumn crocus.

More about autumn daffodil

About Autumn Daffodil

Sternbergia lutea · also called Autumn daffodil, Winter daffodil · flowering

Sternbergia lutea is a small bulbous perennial native to the Mediterranean region and the Middle East, producing brilliant golden-yellow, goblet-shaped flowers in autumn directly alongside or just before the narrow, glossy strap leaves emerge. It thrives in full sun with excellent drainage, alkaline soil, and a warm, dry summer baking period — conditions that replicate its native rocky hillside habitat. Plant the bulbs deeply in a sheltered south-facing border or raised bed in late summer for best results. All parts of this plant contain Amaryllidaceae alkaloids and are toxic to pets.

Growth habit: Small clump-forming bulbous perennial; flowers appear on short stems directly from the ground in autumn, followed by narrow, shiny, strap-like leaves 15–25 cm long that persist through winter and spring before dying back in early summer.

What fertiliser autumn daffodil actually wants — and why

Autumn Daffodil 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 autumn daffodil: 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 autumn daffodil, 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 autumn daffodil:

A light top-dressing of slow-release balanced fertiliser in late summer (as growth begins) is sufficient; avoid high-nitrogen feeds which produce lush foliage at the expense of flowers. 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 autumn daffodil 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 autumn daffodil

Use the bulb-feed label rate for autumn daffodil; 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 autumn daffodil first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the autumn daffodil watering schedule.

Signs you are over-feeding autumn daffodil

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for autumn daffodil:

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 autumn daffodil

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 autumn daffodil 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 autumn daffodil every few years so they are not competing for nutrients.

Organic vs synthetic feeds for autumn daffodil

Organic options

Bonemeal worked in at planting plus a mulch of garden compost or well-rotted leaf-mould is the traditional, reliable approach for autumn daffodil. 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 autumn daffodil — frequently asked questions

What fertiliser does autumn daffodil 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. Autumn Daffodil 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 autumn daffodil?

A light top-dressing of slow-release balanced fertiliser in late summer (as growth begins) is sufficient; avoid high-nitrogen feeds which produce lush foliage at the expense of flowers. A light top-dressing of slow-release balanced fertiliser in late summer (as growth begins) is sufficient; avoid high-nitrogen feeds which produce lush foliage at the expense of flowers. 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 autumn daffodil?