Iris sibirica 'Blue King' (Siberian iris 'Blue King')

Botanical name

Iris sibirica 'Blue King'

Other names

Siberian iris 'Blue King', Iris 'Blue King'

Genus

Iris Iris

Variety or Cultivar

'Blue King' _ 'Blue King' is a clump-forming, herbaceous perennial with linear, strap-like, grey-green leaves and erect stems bearing deep purple-blue flowers with yellow markings in late spring and early summer.

Foliage

Deciduous

Habit

Clump-forming, Erect

Toxicity

Ingestion may cause severe discomfort.

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Colour

Flower

Purple, Blue in Spring; Purple, Blue in Summer

Foliage

Grey-green in Spring; Grey-green in Summer; Grey-green in Autumn

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How to care

Watch out for

Specific pests

Slugs , Snails

Specific diseases

Grey mould , Iris rhizome rot

General care

Pruning

Cut back after flowering to keep tidy.

Propagation methods

Division

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Monthly care advice

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Where to grow

Iris sibirica 'Blue King' (Siberian iris 'Blue King') will reach a height of 0.9m and a spread of 0.4m after 2-5 years.

Suggested uses

Beds and borders, Bog garden, City, Cottage/Informal, Drought Tolerant, Flower Arranging, Roof terrace, Wallside and trellises, Waterside

Cultivation

Grow in most soil that is preferably moist but not waterlogged. In drier soils, dig in well-rotted manure before planting and apply as a mulch each spring.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Well-drained, Moist but well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

South, East, West

Exposure

Exposed, 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

Iris sibirica 'Blue King' (Siberian iris 'Blue King')

Common pest name

Red rice root aphid; Rice root aphid

Scientific pest name

Rhopalosiphum rufiabdominalis

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

Potentially significant glasshouse pest; growers should monitor for its presence. Routine aphid control should be effective in mitigating risk.

Defra's Risk register #2

Plant name

Iris sibirica 'Blue King' (Siberian iris 'Blue King')

Common pest name

common blossom thrips; cotton bud thrips; tomato thrips

Scientific pest name

Frankliniella schultzei

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

Polyphagous glasshouse pest; present in many countries; single finding in UK.

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/