Hibiscus arnottianus (Hawaiian white hibiscus)

Botanical name

Hibiscus arnottianus

Other names

Hawaiian white hibiscus, Pamakani, O'ahu white hibiscus, Hau hele, Koki'o ke'oke'o

Genus

Hibiscus Hibiscus

Species

H. arnottianus - H. arnottianus is a rounded, open, evergreen, large shrub or small tree with ovate, leathery, toothed or smooth, dark green leaves and, in summer, large, solitary, lightly fragrant, funnel-shaped, white flowers with pink veins and red stamens.

Foliage

Evergreen

Habit

Open branches, Rounded

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Colour

Flower

White in Summer

Foliage

Dark-green in All seasons

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How to care

Watch out for

Specific pests

Aphids , Mealybugs , Thrips

Specific diseases

Powdery mildew

General care

Pruning

Pruning group 9. Little or no pruning is usually necessary.

Propagation methods

Layering, Semi-hardwood cuttings, Semi-ripe cuttings

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Monthly care advice

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Where to grow

Hibiscus arnottianus (Hawaiian white hibiscus) will reach a height of 5m and a spread of 5m after 10-20 years.

Suggested uses

Beds and borders, City, Conservatory, Containers, Cottage/Informal, Greenhouse, Wallside and trellises

Cultivation

In frost-free areas, grow in humus-rich, moist but well-drained, neutral to slightly alkaline soil in full sun. Under glass, grow in loam-based compost in bright, filtered light. In growth, water freely & feed monthly; sparingly in winter.

Soil type

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

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Alkaline, Neutral

Light

Full Sun

Aspect

South, West

Exposure

Sheltered

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

Indoor heated (H1), Tender in frost (H3)

USDA zones

Zone 11, Zone 10

Defra's Risk register #1

Plant name

Hibiscus arnottianus (Hawaiian white hibiscus)

Common pest name

Cassava whitefly; Cotton whitefly; Sweet potato whitefly; Tobacco whitefly

Scientific pest name

Bemisia tabaci non-European populations

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)

5

General biosecurity comments

Non-European populations of Bemisia tabaci pose an additional risk to European populations due to the potential for introducing non-European viruses.

Defra's Risk register #2

Plant name

Hibiscus arnottianus (Hawaiian white hibiscus)

Common pest name

Lance nematode; Nematode; Lance

Scientific pest name

Hoplolaimus spp.

Type

Nematode

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)

4

General biosecurity comments

Nematode species potentially affecting a wide variety of crops; prohibition of soil likely to mitigate risk substantially; keep under review in light of interceptions or findings should they occur in the EU.

Defra's Risk register #3

Plant name

Hibiscus arnottianus (Hawaiian white hibiscus)

Common pest name

Cassava whitefly; Cotton whitefly; Sweet potato whitefly; Tobacco whitefly

Scientific pest name

Bemisia tabaci European populations

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)

4

General biosecurity comments

The UK has a protected zone in place for this pest which helps to mitigate the risk of entry and establishment. An EFSA opinion is currently being discussed at the EU Annexes Working Group which recommends further strengthening of the regulation.

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/