Fertilising guide

How to fertilise Striped Squill (Puschkinia scilloides)— schedule & NPK

Also called Striped Squill, Libanotica Squill, Lebanese Squill.

More about striped squill

About Striped Squill

Puschkinia scilloides · also called Striped Squill, Libanotica Squill · flowering

A compact, early-spring bulb bearing pale blue-white flowers, each petal striped with a deeper blue central line. Native to the Caucasus, Lebanon, and northern Iran, Striped Squill naturalises readily in lawns and rock gardens. Plant bulbs in autumn for carefree spring colour; tolerates cold, drought in dormancy, and light competition from grass.

Growth habit: Small clump-forming bulb; produces 2 strap-like basal leaves and a raceme of 4–12 flowers per stem. Spreads by offsets and self-seeding to form naturalised colonies.

What fertiliser striped squill actually wants — and why

Striped Squill 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 striped squill: 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 striped squill, 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 striped squill:

Generally self-sufficient when naturalised. A light application of balanced bulb fertiliser or bone meal at planting aids establishment. Top-dress with compost in autumn if grown in containers. Excess nitrogen encourages foliage over 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 striped squill 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 striped squill

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

Signs you are over-feeding striped squill

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

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 striped squill

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 striped squill 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 striped squill every few years so they are not competing for nutrients.

Organic vs synthetic feeds for striped squill

Organic options

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

What fertiliser does striped squill 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. Striped Squill 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 striped squill?

Generally self-sufficient when naturalised. A light application of balanced bulb fertiliser or bone meal at planting aids establishment. Top-dress with compost in autumn if grown in containers. Excess nitrogen encourages foliage over flowers. Generally self-sufficient when naturalised. A light application of balanced bulb fertiliser or bone meal at planting aids establishment. Top-dress with compost in autumn if grown in containers. Excess nitrogen encourages foliage over 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 striped squill?