Iris sibirica 'Butter and Sugar' (Siberian iris 'Butter and Sugar')

Botanical name

Iris sibirica 'Butter and Sugar'

Other names

Siberian iris 'Butter and Sugar'

Genus

Iris Iris

Variety or Cultivar

'Butter and Sugar' _ 'Butter and Sugar' is a clump-forming, herbaceous perennial with upright, strap-like, grey-green leaves and tall, erect stems bearing white flowers with yellow falls in late spring

Foliage

Deciduous

Habit

Clump-forming, Erect

Toxicity

Ingestion may cause severe discomfort.

Awards

RHS AGM (Award of Garden Merit)

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Colour

Flower

White, Yellow 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 'Butter and Sugar' (Siberian iris 'Butter and Sugar') will reach a height of 0.65m and a spread of 0.65m after 2-5 years.

Suggested uses

Cottage/Informal, Flower Arranging, Beds and borders, City, Roof terrace, Wallside and trellises

Cultivation

Plant in any soil that is moist but not waterlogged.

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 8, Zone 7, Zone 6, Zone 5

Defra's Risk register #1

Plant name

Iris sibirica 'Butter and Sugar' (Siberian iris 'Butter and Sugar')

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 'Butter and Sugar' (Siberian iris 'Butter and Sugar')

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/