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Iris hookeri (Hooker's blue flag)

Skill rating
skill rating
Maintenance level
1 hour care
per year
Ultimate height
Max height
Ultimate spread
Max spread
Time to maturity
2-5 years
To maturity
Toxic - Ingestion may cause severe discomfort.

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

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

Flower: Violet in Spring; Violet in Summer

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

Habit: Clump-forming, Compact, Upright

Toxicity: Ingestion may cause severe discomfort.

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.. REGISTER to read more...

Propagation: Divide rhizomes from midsummer to early autumn.. REGISTER to read more...

Propagation methods: Division. REGISTER to

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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

Hardiness: Hardy (H4)

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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...


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