Allium senescens (German garlic)

Botanical name

Allium senescens

Other names

German garlic, Broadleaf chives, Mountain garlic, Spiral onion, Curley chives, Curly chives, Mountain leek, Corkscrew onion, Ornamental onion

Genus

Allium Allium

Species

A. senescens - A. senescens is a vigorous, clump-forming, bulbous perennial with strap-shaped, mid-green leaves and erect stems bearing dense umbels of cup-shaped, purple-pink flowers in summer.

Foliage

Deciduous

Habit

Clump-forming, Erect flower stem

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Colour

Flower

Purple-pink in Summer

Foliage

Mid-green in Spring; Mid-green in Summer

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How to care

Watch out for

Pests

Pest free, may suffer from slugs on new growth.

Specific pests

Onion fly

Specific diseases

Onion rot , Downy mildew

General care

Pruning

Though a bulb, clumps can be divided when they become crowded. Remove faded flower stems. Cut leaves back after they have completely died down.

Propagation

Though a bulb, clumps can be divided in spring when they become crowded.

Propagation methods

Division, Offsets, Seed

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Monthly care advice

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Where to grow

Allium senescens (German garlic) will reach a height of 0.6m and a spread of 0.2m after 2-5 years.

Suggested uses

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

Cultivation

Grow in fertile, but well-drained soil in sun. Add grit to heavy soils to improve drainage. Drought tolerant once established.

Soil type

Chalky, Loamy, Sandy

Soil drainage

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, Zone 5, Zone 4, Zone 3

Defra's Risk register #1

Plant name

Allium senescens (German 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 #2

Plant name

Allium senescens (German 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 #3

Plant name

Allium senescens (German garlic)

Common pest name

American serpentine leaf miner; chrysanthemum leaf miner

Scientific pest name

Liriomyza trifolii

Type

Insect

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

Regulated pest already subject to review at the EU level (2013). Regularly intercepted in the trade.

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