Getting it to bloom

Why won't my Two-leaf Squill bloom? (and how to make it flower)

Also called Two-leaf Squill, Alpine Squill (Scilla bifolia).

More about two-leaf squill

About Two-leaf Squill

Scilla bifolia · also called Two-leaf Squill, Alpine Squill · flowering

Scilla bifolia is one of the earliest spring bulbs, producing starry blue to violet flowers on arching stems just 10–15 cm tall in late winter and early spring. Characteristically, each bulb bears only two narrow leaves. It naturalises vigorously under deciduous trees and in short grass, spreading by offsets and self-seeding to form carpets of intense blue colour.

Plant type: flowering

Watch for — Short flowering window: Individual plants bloom for only 2–3 weeks in late winter. Plant in large drifts and combine with other early bulbs (Galanthus, Eranthis) to extend seasonal interest, as there is no way to prolong the bloom period.

The reasons two-leaf squill isn't blooming

Almost every non-blooming two-leaf squill traces back to one of these, roughly in order of how common they are:

Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.
Too much nitrogen feed, driving lush foliage at the expense of flowers (very common with general or lawn feeds).
The plant has not been deadheaded, so it stops flowering once it sets seed.
Irregular watering — drought or waterlogging at the budding stage makes buds abort.
It is still too young or was checked by a transplant and is rebuilding before flowering.

Feeding two-leaf squill a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.

The fix — how to get two-leaf squill to flower

Maximise sun. Give two-leaf squill the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers.
Switch the feed. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
Deadhead regularly. Remove spent flowers often to keep it producing more rather than stopping to set seed.
Water consistently. Keep moisture even through budding and flowering — drought-then-flood swings make buds drop.

Light and feeding do most of the heavy lifting here. Dial in the spot with the light guide for two-leaf squill and get the feeding right with the two-leaf squill fertilising schedule — the wrong feed (too much nitrogen) is one of the most common silent reasons a healthy plant makes leaves instead of flowers.

Bloom season and what to expect

Two-leaf Squill flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.

Post-bloom care so it flowers again

Deadhead, keep feeding lightly, and many will rebloom; collect seed from the best plants at the end of the season if you want to grow them again.

For everything else this plant needs day to day, see the full two-leaf squill care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Two-leaf Squill blooming — frequently asked questions

Why won't my two-leaf squill flower?

Two-leaf Squill blooms on the season's growth given enough sun, warmth and the right feed — there is no cold or photoperiod trick, just good growing conditions and a bloom-leaning feed. The most common reason it is not happening: Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.

How do I make two-leaf squill bloom?

Give two-leaf squill the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.

When does two-leaf squill normally bloom?