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Allium sphaerocephalon (Roundhead leek)

Beginner
skill rating
2 hours care
per year
0.9m
Max height
0.1m
Max spread
2-5 years
To maturity

Plant details

Botanical name

Allium sphaerocephalon

Other names

Roundhead leek, Round-headed allium

Genus

Allium Allium

Species

A. sphaerocephalon - A. sphaerocephalon is a bulbous perennial with strap-like, mid-green basal leaves and tall stems bearing small round or oval pink to purple-red flowerheads in summer


Allium sphaerocephalon is: Deciduous

Habit

Erect, Spreading

Flower

Pink, Reddish-purple in Summer

Foliage

Mid-green in Spring; Mid-green in Summer

How to care

Watch out for

Downy mildew , Onion rot Downy mildew , Onion rot

General care

Propagation methods

Division, Seed


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Where to grow

Allium sphaerocephalon (Roundhead leek) will reach a height of 0.9m and a spread of 0.1m after 2-5 years.

Suggested uses

Architectural, Beds and borders, Cottage/Informal, Flower Arranging, Gravel, Underplanting

Cultivation

Grows in fertile, well-drained soil. Add grit to clay soils to improve drainage.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Full Sun

Aspect

North, South, East, West

Exposure

Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

Companion plants

Botanical name

Allium sphaerocephalon

Other names

Roundhead leek, Round-headed allium

Genus

Allium Allium

Species

A. sphaerocephalon - A. sphaerocephalon is a bulbous perennial with strap-like, mid-green basal leaves and tall stems bearing small round or oval pink to purple-red flowerheads in summer

Foliage

Deciduous

Habit

Erect, Spreading


Colour

Flower

Pink, Reddish-purple in Summer

Foliage

Mid-green in Spring; Mid-green in Summer


How to care

Watch out for

Specific diseases

Downy mildew , Onion rot

General care

Propagation methods

Division, Seed


Monthly care advice


Where to grow

Allium sphaerocephalon (Roundhead leek) will reach a height of 0.9m and a spread of 0.1m after 2-5 years.

Suggested uses

Architectural, Beds and borders, Cottage/Informal, Flower Arranging, Gravel, Underplanting

Cultivation

Grows in fertile, well-drained soil. Add grit to clay soils to improve drainage.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Full Sun

Aspect

North, South, East, West

Exposure

Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

USDA zones

Zone 9, Zone 8, Zone 7, Zone 6

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Allium sphaerocephalon (Roundhead leek)

Allium sphaerocephalon (Roundhead leek)

Allium sphaerocephalon (Roundhead leek)

Allium sphaerocephalon (Roundhead leek)

Allium sphaerocephalon

Allium sphaerocephalon (Roundhead leek)

(22/11/2012)

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This plant likes... Garden match
Soil types: Chalky, Clay, Loamy, Sandy (will tolerate most soil types) Tell us...
Soil drainage: Moist but well-drained, Well-drained Tell us...
Soil pH: Acid, Alkaline, Neutral Tell us...
Light: Full Sun Tell us...
Aspect: North, South, East, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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View all 18 articles


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