Iris 'Holden Clough' (Iris 'Holden Clough')

Botanical name

Iris 'Holden Clough'

Other names

Iris 'Holden Clough', Laevigatae iris 'Holden Clough', Yellow flag 'Holden Clough'

Genus

Iris Iris

Variety or Cultivar

'Holden Clough' _ 'Holden Clough' is an erect, clump-forming, rhizomatous, evergreen to semi-evergreen perennial with arching, grey-green leaves and branching stems bearing purple-veined, yellow flowers in late spring and early summer.

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

Yellow, Veined in Spring; Yellow, Veined in Summer

Foliage

Grey-green in All seasons

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How to care

Watch out for

Specific pests

Aphids , Caterpillars , Slugs

Diseases

May be subject to a virus.

Specific diseases

Grey mould , Iris rhizome rot

General care

Pruning

Remove spent flower stems.

Propagation

Divide rhizomes after the plant has finished flowering, approximately every 3 years.

Propagation methods

Division

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Monthly care advice

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Where to grow

Iris 'Holden Clough' (Iris 'Holden Clough') will reach a height of 0.9m and a spread of 0.5m after 2-5 years.

Suggested uses

Beds and borders, City, Coastal, Cottage/Informal

Cultivation

Grow in moist soil in full sun or partial shade. In drier conditions, dig in well-rotted organic matter prior to planting. Mulch every spring.

Soil type

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

Soil drainage

Moist but well-drained, Moisture-retentive

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 8, Zone 7, Zone 6, Zone 5

Defra's Risk register #1

Plant name

Iris 'Holden Clough' (Iris 'Holden Clough')

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 'Holden Clough' (Iris 'Holden Clough')

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/