Iris 'Semiramis' (Iris 'Semiramis')

Botanical name

Iris 'Semiramis'

Other names

Iris 'Semiramis', Tall bearded iris 'Semiramis'

Genus

Iris Iris

Variety or Cultivar

'Semiramis' _ 'Semiramis' is a clump-forming, rhizomatous perennial with sword-shaped, grey-green leaves and in late spring and early summer, slender, upright stems bearing yellow flowers, paler in the centre of each fall.

Foliage

Deciduous

Habit

Clump-forming, Erect

Toxicity

Ingestion may cause severe discomfort.

---

Colour

Flower

Yellow in Spring; Yellow 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 'Semiramis' (Iris 'Semiramis') will reach a height of 0.9m and a spread of 0.45m after 2-5 years.

Suggested uses

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

Cultivation

Will perform best in full sun in well-drained, neutral or slightly acidic loam. Divide and replant every three years.

Soil type

Loamy, Sandy

Soil drainage

Well-drained

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 'Semiramis' (Iris 'Semiramis')

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 'Semiramis' (Iris 'Semiramis')

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/