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Iris hookeri (Hooker's blue flag)

Intermediate
skill rating
1 hour care
per year
0.3m
Max height
0.2m
Max spread
2-5 years
To maturity
Low
Toxicity

Plant details

Botanical name

Iris hookeri

Other names

Hooker's blue flag, Beach-head iris, Iris setosa subsp. canadensis, Iris canadensis, Iris setosa 'Hookeri', Iris setosa dwarf, Iris setosa var. nana

Genus

Iris Iris

Species

I. hookeri - I. hookeri is a compact, clump-forming, somewhat variable, rhizomatous perennial with sword-shaped, mid- to grey-green leaves and, in mid- to late spring, or in early summer, upright stems bearing flowers with small standards and veined, often white-centred, violet-blue to purple falls.


Iris hookeri is: Deciduous

Habit

Clump-forming, Compact, Upright

Toxicity

Ingestion may cause severe discomfort.

Flower

Violet in Spring; Violet in Summer

Foliage

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

How to care

Watch out for

Specific pests

Slugs , Snails , Thrips Slugs , Snails , Thrips

Grey mould , Iris rhizome rot , Leaf spot , Virus Grey mould , Iris rhizome rot , Leaf spot , Virus

General care

Pruning

Cut down spent flower stems. Remove dead foliage in autumn.

Propagation

Divide rhizomes from midsummer to early autumn.

Propagation methods

Division


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Where to grow

Iris hookeri (Hooker's blue flag) will reach a height of 0.3m and a spread of 0.2m after 2-5 years.

Suggested uses

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

Cultivation

Grow in moist, neutral to acid soil in full sun. Best planted in late summer and early autumn. Naturally occurs in salt spray zones. Flowers earlier in warmer climates. Divide and replant every three years.

Soil type

Loamy, Sandy

Soil drainage

Moist but well-drained, Moisture-retentive

Soil pH

Acid, Neutral

Light

Full Sun

Aspect

South, East

Exposure

Exposed, Sheltered

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

Hardy (H4)

Companion plants

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

Botanical name

Iris hookeri

Other names

Hooker's blue flag, Beach-head iris, Iris setosa subsp. canadensis, Iris canadensis, Iris setosa 'Hookeri', Iris setosa dwarf, Iris setosa var. nana

Genus

Iris Iris

Species

I. hookeri - I. hookeri is a compact, clump-forming, somewhat variable, rhizomatous perennial with sword-shaped, mid- to grey-green leaves and, in mid- to late spring, or in early summer, upright stems bearing flowers with small standards and veined, often white-centred, violet-blue to purple falls.

Foliage

Deciduous

Habit

Clump-forming, Compact, Upright

Toxicity

Ingestion may cause severe discomfort.


Colour

Flower

Violet in Spring; Violet in Summer

Foliage

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


How to care

Watch out for

Specific pests

Slugs , Snails , Thrips

Specific diseases

Grey mould , Iris rhizome rot , Leaf spot , Virus

General care

Pruning

Cut down spent flower stems. Remove dead foliage in autumn.

Propagation

Divide rhizomes from midsummer to early autumn.

Propagation methods

Division


Monthly care advice


Where to grow

Iris hookeri (Hooker's blue flag) will reach a height of 0.3m and a spread of 0.2m after 2-5 years.

Suggested uses

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

Cultivation

Grow in moist, neutral to acid soil in full sun. Best planted in late summer and early autumn. Naturally occurs in salt spray zones. Flowers earlier in warmer climates. Divide and replant every three years.

Soil type

Loamy, Sandy

Soil drainage

Moist but well-drained, Moisture-retentive

Soil pH

Acid, Neutral

Light

Full Sun

Aspect

South, East

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, Zone 4, Zone 3

Defra's Risk register #1

Plant name

Iris hookeri (Hooker's blue flag)

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 hookeri (Hooker's blue flag)

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: 7th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/

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in wild by Todd Boland (04/02/2013)

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This plant likes... Garden match
Soil types: Loamy, Sandy Tell us...
Soil drainage: Moist but well-drained, Moisture-retentive Tell us...
Soil pH: Acid, Neutral Tell us...
Light: Full Sun Tell us...
Aspect: South, East Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

GARDENS WITH THIS PLANT

ALPINES IN MY GARDEN
ALPINES IN MY GARDEN
cleycoins@tiscali.co.uk
Old garden
Old garden
Sue Kunzmann

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