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Allium nigrum (Black garlic)

Beginner
skill rating
1 hour care
per year
0.45m
Max height
0.4m
Max spread
2-5 years
To maturity

Plant details

Botanical name

Allium nigrum

Other names

Allium multibulbosum, Black garlic, Broad-leaved onion , Allium afrum, Allium bauerianum, Allium magicum, Allium paucibulbosum, Kalabotis nigrum

Genus

Allium Allium

Species

A. nigrum - A. nigrum is a bulbous perennial with strap-shaped leaves. In mid-summer, it produces globular heads of white, star-shaped flowers on upright stems. It gets its name from the dark centres to its flowers.


Allium nigrum is: Deciduous

Habit

Upright

Flower

White 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

Propagation methods

Offsets, Seed


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Where to grow

Allium nigrum (Black garlic) will reach a height of 0.45m and a spread of 0.4m after 2-5 years.

Suggested uses

Beds and borders, City, Cottage/Informal, Gravel, Low Maintenance

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), Tender in frost (H3)

Companion plants

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

Botanical name

Allium nigrum

Other names

Allium multibulbosum, Black garlic, Broad-leaved onion , Allium afrum, Allium bauerianum, Allium magicum, Allium paucibulbosum, Kalabotis nigrum

Genus

Allium Allium

Species

A. nigrum - A. nigrum is a bulbous perennial with strap-shaped leaves. In mid-summer, it produces globular heads of white, star-shaped flowers on upright stems. It gets its name from the dark centres to its flowers.

Native to

Mediterranean

Foliage

Deciduous

Habit

Upright


Colour

Flower

White 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

Propagation methods

Offsets, Seed


Monthly care advice


Where to grow

Allium nigrum (Black garlic) will reach a height of 0.45m and a spread of 0.4m after 2-5 years.

Suggested uses

Beds and borders, City, Cottage/Informal, Gravel, Low Maintenance

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), Tender in frost (H3)

USDA zones

Zone 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4

Defra's Risk register #1

Plant name

Allium nigrum (Black garlic)

Common pest name

allium leaf miner

Scientific pest name

Phytomyza gymnostoma

Type

Insect

Current status in UK

Present (Limited)

Likelihood to spread in UK (1 is very low - 5 is very high)

3

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Pest of Allium already present in UK and spreading; previous consultation supported awareness raising only; industry should prepare for the event of findings in commercial crops.

Defra's Risk register #2

Plant name

Allium nigrum (Black garlic)

Common pest name

Asain cotton leafworm; Cluster caterpillar; Fall armyworm; Rice cutworm; Taro caterpiller; Tobacco budworm; Tobacco caterpillar; Tobacco cutworm; Tobacco leaf caterpillar

Scientific pest name

Spodoptera litura

Type

Insect

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

3

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Regulated pest; frequently intercepted with occasional outbreaks which have been successfully eradicated in the UK.

Defra's Risk register #3

Plant name

Allium nigrum (Black garlic)

Common pest name

Nematode; common spiral; Spiral nematode; Steiners spiral nematode

Scientific pest name

Helicotylenchus dihystera

Type

Nematode

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

2

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Nematode pest unlikely to be very damaging in its own right; but used as a an indicator species to assess compliance of soil requirements of imported plants to be kept under review in light of EFSA evaluation of soil requirements.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read "Don't risk it" advice here

Suspected outbreak? Click here for contact details to report to the relevant authority.

Date updated: 7th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/

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Allium nigrum (Black garlic)

Allium nigrum (Black garlic)

Allium nigrum (Black garlic)

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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), Tender in frost (H3) Tell us...

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