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Allium cepa 'Deep Purple' (Spring onion 'Deep Purple')

Advanced
skill rating
4 hours care
per year
0.4m
Max height
0.3m
Max spread
1-2 years
To maturity

Plant details

Botanical name

Allium cepa 'Deep Purple'

Other names

Spring onion 'Deep Purple', Allium fistulosum 'Deep Purple'

Genus

Allium Allium

Variety or Cultivar

'Deep Purple' _ 'Deep Purple' is a perennial grown as an edible vegetable with linear, hollow grey-green leaves and torpedo-shaped violet-purple onions typically harvested from summer into autumn.


Allium cepa 'Deep Purple' is: Deciduous

Habit

Clump-forming, Upright

Awards

RHS AGM (Award of Garden Merit)

Foliage

Green in Summer

How to care

Watch out for

Specific pests

Eelworm (stem and bulb) , Leek moth , Onion fly Eelworm (stem and bulb) , Leek moth , Onion fly

Bolting , Bull neck , Downy mildew , Neck rot , Rust , Saddleback , Shanking , Smut , White rot , White tip Bolting , Bull neck , Downy mildew , Neck rot , Rust , Saddleback , Shanking , Smut , White rot , White tip

General care

Pruning

Break off any flower heads that appear.

Propagation methods

Seed, Sets


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Where to grow

Allium cepa 'Deep Purple' (Spring onion 'Deep Purple') will reach a height of 0.4m and a spread of 0.3m after 1-2 years.

Suggested uses

Add to salads, Beds and borders, Flavouring food and drinks

Cultivation

Grow from seed in prepared onion beds in a sunny position. It is a good idea to rotate site annually. When preparing bed in autumn add lime if soil is acid. Before sowing apply a general fertilizer, rake over, tread down and rake again.

Soil type

Loamy, Sandy

Soil drainage

Well-drained

Soil pH

Alkaline, Neutral

Light

Full Sun

Aspect

South, West

Exposure

Sheltered

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

Tender in frost (H3)

Companion plants

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

Botanical name

Allium cepa 'Deep Purple'

Other names

Spring onion 'Deep Purple', Allium fistulosum 'Deep Purple'

Genus

Allium Allium

Variety or Cultivar

'Deep Purple' _ 'Deep Purple' is a perennial grown as an edible vegetable with linear, hollow grey-green leaves and torpedo-shaped violet-purple onions typically harvested from summer into autumn.

Foliage

Deciduous

Habit

Clump-forming, Upright

Awards

RHS AGM (Award of Garden Merit)


Colour

Foliage

Green in Summer


How to care

Watch out for

Specific pests

Eelworm (stem and bulb) , Leek moth , Onion fly

Specific diseases

Bolting , Bull neck , Downy mildew , Neck rot , Rust , Saddleback , Shanking , Smut , White rot , White tip

General care

Pruning

Break off any flower heads that appear.

Propagation methods

Seed, Sets


Monthly care advice


Where to grow

Allium cepa 'Deep Purple' (Spring onion 'Deep Purple') will reach a height of 0.4m and a spread of 0.3m after 1-2 years.

Suggested uses

Add to salads, Beds and borders, Flavouring food and drinks

Cultivation

Grow from seed in prepared onion beds in a sunny position. It is a good idea to rotate site annually. When preparing bed in autumn add lime if soil is acid. Before sowing apply a general fertilizer, rake over, tread down and rake again.

Soil type

Loamy, Sandy

Soil drainage

Well-drained

Soil pH

Alkaline, Neutral

Light

Full Sun

Aspect

South, West

Exposure

Sheltered

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

Tender in frost (H3)

Defra's Risk register #1

Plant name

Allium cepa 'Deep Purple' (Spring onion 'Deep Purple')

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 cepa 'Deep Purple' (Spring onion 'Deep Purple')

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 cepa 'Deep Purple' (Spring onion 'Deep Purple')

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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This plant likes... Garden match
Soil types: Loamy, Sandy Tell us...
Soil drainage: Well-drained Tell us...
Soil pH: Alkaline, Neutral Tell us...
Light: Full Sun Tell us...
Aspect: South, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Tender in frost (H3) Tell us...

GARDENS WITH THIS PLANT

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My Garden
Kate Kett

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