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Allium giganteum (Giant allium)

Beginner
skill rating
2 hours care
per year
1.5m
Max height
0.5m
Max spread
2-5 years
To maturity

Plant details

Botanical name

Allium giganteum

Other names

Giant allium

Genus

Allium Allium

Species

A. giganteum - A. giganteum has spreading, strap-shaped basal leaves which die down before the flowers, and tall stems bearing round umbels of bright purple flowers in summer.


Allium giganteum is: Deciduous

Fragrance

Foliage has a nice fragrence

Habit

Erect

Awards

RHS AGM (Award of Garden Merit)

Flower

Purple in Summer

Foliage

Grey-green in Summer

How to care

Watch out for

Pests

Pest free, may suffer from slugs on new growth.

Onion rot , Downy mildew Onion rot , Downy mildew

General care

Pruning

No pruning required.

Propagation methods

Division, Seed


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Where to grow

Allium giganteum (Giant allium) will reach a height of 1.5m and a spread of 0.5m after 2-5 years.

Suggested uses

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

Cultivation

Grow in fertile, but 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

South, East, West

Exposure

Sheltered

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

Hardy (H4)

Companion plants

We do not currently have companion plants added for this plant.

Botanical name

Allium giganteum

Other names

Giant allium

Genus

Allium Allium

Species

A. giganteum - A. giganteum has spreading, strap-shaped basal leaves which die down before the flowers, and tall stems bearing round umbels of bright purple flowers in summer.

Foliage

Deciduous

Fragrance

Foliage has a nice fragrence

Habit

Erect

Awards

RHS AGM (Award of Garden Merit)


Colour

Flower

Purple in Summer

Foliage

Grey-green in Summer


How to care

Watch out for

Pests

Pest free, may suffer from slugs on new growth.

Specific diseases

Onion rot , Downy mildew

General care

Pruning

No pruning required.

Propagation methods

Division, Seed


Monthly care advice


Where to grow

Allium giganteum (Giant allium) will reach a height of 1.5m and a spread of 0.5m after 2-5 years.

Suggested uses

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

Cultivation

Grow in fertile, but 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

South, East, West

Exposure

Sheltered

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

Hardy (H4)

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(14/05/2011)

(05/06/2013)

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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: South, East, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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