Fertilising guide

How to fertilise Early Squill (Scilla mischtschenkoana)— schedule & NPK

Also called Early Squill, Mishchenko Squill, White Squill, Tubergen Squill.

More about early squill

About Early Squill

Scilla mischtschenkoana · also called Early Squill, Mishchenko Squill · flowering

Scilla mischtschenkoana is a very early-flowering bulbous perennial native to the mountains of northern Iran, Azerbaijan, and the Caucasus, where it pushes through snow to bloom as early as February in mild conditions. Each bulb produces several racemes of delicate pale ice-blue flowers marked with a darker central stripe, blooms that can remain attractive for up to two months — an unusually long display for a spring bulb. It is an RHS Award of Garden Merit holder and ideal for naturalising in grass, rock gardens, or at the front of borders. All parts are toxic to cats and dogs.

Growth habit: Small clump-forming bulbous perennial that emerges and flowers from mid-winter, dying back to dormancy by late spring

What fertiliser early squill actually wants — and why

Early 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 early 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 early 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 early squill:

Largely self-sufficient when naturalised in reasonable soil; apply a granular bulb fertiliser in early autumn where soils are poor or impoverished. 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 early 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 early squill

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

Signs you are over-feeding early squill

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for early 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 early 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 early 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 early squill every few years so they are not competing for nutrients.

Organic vs synthetic feeds for early 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 early 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 early squill — frequently asked questions

What fertiliser does early 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. Early 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 early squill?

Largely self-sufficient when naturalised in reasonable soil; apply a granular bulb fertiliser in early autumn where soils are poor or impoverished. Largely self-sufficient when naturalised in reasonable soil; apply a granular bulb fertiliser in early autumn where soils are poor or impoverished. 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 early squill?