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Crambe maritima (Sea kale)

Beginner
skill rating
2 hours care
per year
0.75m
Max height
0.6m
Max spread
2-5 years
To maturity

Plant details

Botanical name

Crambe maritima

Other names

Sea kale, Sea cabbage , Sea colewort , Seakale

Genus

Crambe Crambe

Species

C. maritima - C. maritima is a spreading, mounding perennial with large, round, ruffled, blue-green leaves. In early summer it has thick stems that are topped with flat racemes of white, scented flowers.


Crambe maritima is: Deciduous

Fragrance

The flowers are scented.

Habit

Cushion or Mound Forming, Spreading

Flower

White in Summer

Foliage

Blue-green in Summer; Blue-green in Autumn

How to care

Watch out for

Specific pests

Caterpillars , Flea beetles , Slugs Caterpillars , Flea beetles , Slugs

Clubroot Clubroot

General care

Pruning

Cut down to ground level in autumn.

Propagation methods

Division, Seed, Root cuttings


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Where to grow

Crambe maritima (Sea kale) will reach a height of 0.75m and a spread of 0.6m after 2-5 years.

Suggested uses

Add to salads, Architectural, Beds and borders, Cottage/Informal, Flower Arranging, Wildlife

Cultivation

Grows bestfertile, well-drained soil in full sun. It will tolerate poor soil and light shade, but needs shelter from strong winds.

Soil type

Chalky, Loamy, Sandy

Soil drainage

Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, 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

Combine with something evergreen in front of this plant, as the leaves can become scruffy.

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

Botanical name

Crambe maritima

Other names

Sea kale, Sea cabbage , Sea colewort , Seakale

Genus

Crambe Crambe

Species

C. maritima - C. maritima is a spreading, mounding perennial with large, round, ruffled, blue-green leaves. In early summer it has thick stems that are topped with flat racemes of white, scented flowers.

Foliage

Deciduous

Fragrance

The flowers are scented.

Habit

Cushion or Mound Forming, Spreading


Colour

Flower

White in Summer

Foliage

Blue-green in Summer; Blue-green in Autumn


How to care

Watch out for

Specific pests

Caterpillars , Flea beetles , Slugs

Specific diseases

Clubroot

General care

Pruning

Cut down to ground level in autumn.

Propagation methods

Division, Seed, Root cuttings


Monthly care advice


Where to grow

Crambe maritima (Sea kale) will reach a height of 0.75m and a spread of 0.6m after 2-5 years.

Suggested uses

Add to salads, Architectural, Beds and borders, Cottage/Informal, Flower Arranging, Wildlife

Cultivation

Grows bestfertile, well-drained soil in full sun. It will tolerate poor soil and light shade, but needs shelter from strong winds.

Soil type

Chalky, Loamy, Sandy

Soil drainage

Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

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

Defra's Risk register #1

Plant name

Crambe maritima (Sea kale)

Common pest name

Cassava whitefly; Cotton whitefly; Sweet potato whitefly; Tobacco whitefly

Scientific pest name

Bemisia tabaci non-European populations

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)

5

General biosecurity comments

Non-European populations of Bemisia tabaci pose an additional risk to European populations due to the potential for introducing non-European viruses.

Defra's Risk register #2

Plant name

Crambe maritima (Sea kale)

Common pest name

Lance nematode; Nematode; Lance

Scientific pest name

Hoplolaimus spp.

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)

4

General biosecurity comments

Nematode species potentially affecting a wide variety of crops; prohibition of soil likely to mitigate risk substantially; keep under review in light of interceptions or findings should they occur in the EU.

Defra's Risk register #3

Plant name

Crambe maritima (Sea kale)

Common pest name

Cassava whitefly; Cotton whitefly; Sweet potato whitefly; Tobacco whitefly

Scientific pest name

Bemisia tabaci European populations

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)

4

General biosecurity comments

The UK has a protected zone in place for this pest which helps to mitigate the risk of entry and establishment. An EFSA opinion is currently being discussed at the EU Annexes Working Group which recommends further strengthening of the regulation.

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: Chalky, Loamy, Sandy Tell us...
Soil drainage: Well-drained Tell us...
Soil pH: Acid, Alkaline, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: South, East, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

COMPANION PLANTS

Combine with something evergreen in front of this plant, as the leaves can become scruffy.

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

DISCUSS THIS PLANT

Crambe maritima

Sea-kale was once extensively cultivated as a vegetable, so much so that it was even exported. The young shoots are blanched under pots to reduce bitterness. They can then be picked and served like… read more

This plant is featured at Chelsea Flower Show 2009

Crambe maritima (Sea kale) has been used in The Daily Telegraph for Chelsea Flower Show 2009. read more

There are 2 active discussions about Crambe maritima (Sea kale)

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