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Bulbs

Scilla × allenii

hybrid squill

A naturally occurring hybrid between Chionodoxa siehei and Scilla bifolia, looking very like a Chionodoxa, but with the flower segments divided to the base. A "little blue bulb" with 2-3 upright to lax strap-shaped leaves to 10cm, and 2-6 violet blue starry to shallow bowl shaped flowers, with slightly paler centres, borne just above the leaves in spreading racemes, in mid-spring

Synonyms

× Chionoscilla allenii

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Ultimate height

0.1–0.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0–0.1 metre

Chalk

Loam

Sand

Moisture

Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

West–facing or East–facing or South–facing

Exposure

Exposed or Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Asparagaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Columnar upright
Potentially harmful: Ornamental bulbs - not to be eaten. Wear gloves and other protective equipment when handling. Pets: Ornamental bulbs - not to be eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus: Scilla are perennial bulbs with narrow basal leaves and erect stems bearing racemes of star-shaped, flat or bell-shaped flowers which are often blue
Name status: Correct

How to grow

Cultivation

Ideal for naturalising in grass or a gravel garden in full sun and a well-drained soil. Plant bulbs two to three times their depth. See bulb cultivation and bulbs: naturalising

Propagation

Propagate by seed, sown in pots in a cold frame when ripe, keep shaded and do not allow to dry out. Alternatively remove offsets in summer. See bulb propagation

Suggested planting locations and garden types

City and courtyard gardens
Rock garden
Cottage and informal garden
Patio and container plants
Flower borders and beds
Underplanting of roses and shrubs

Pruning

No pruning required

Pests

Generally pest-free

Diseases

May be susceptible to anther smuts and virus diseases

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