Hibiscus coccineus white-flowered (White-flowered American rose mallow)

Botanical name

Hibiscus coccineus white-flowered

Other names

White-flowered American rose mallow, White Texas star, White rose mallow, Hibiscus coccineus 'Alba', Hibiscus coccineus 'Albus', Hibiscus coccineus 'Lone Star'

Genus

Hibiscus Hibiscus

Variety or Cultivar

H. coccineus white-flowered _ H. coccineus white-flowered is a vigorous, erect, deciduous perennial or subshrub with palmate leaves divided into narrowly lance-shaped, toothed, dark green leaflets and star-shaped, white flowers from midsummer into autumn.

Native to

Southeastern United States

Foliage

Deciduous

Habit

Erect

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Colour

Flower

White in Summer; White in Autumn

Foliage

Dark-green in Spring; Dark-green in Summer; Dark-green in Autumn

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How to care

Watch out for

Specific pests

Aphids , Mealybugs , Thrips

Specific diseases

Powdery mildew

General care

Pruning

Pruning group 1.

Propagation methods

Layering, Seed, Semi-hardwood cuttings

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Monthly care advice

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Where to grow

Hibiscus coccineus white-flowered (White-flowered American rose mallow) will reach a height of 2m and a spread of 1.5m after 2-5 years.

Suggested uses

City, Coastal, Cottage/Informal, Beds and borders, Hedging/Screens, Containers, Wallside and trellises

Cultivation

Grow in moist or moist but well-drained soil in sun or partial shade. Flowering is reduced and plants become leggy in too much shade. Tolerates heat and humidity if soil is kept consistently moist. Mulch in cold areas. May require staking.

Soil type

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

Soil drainage

Moisture-retentive, Moist but well-drained

Soil pH

Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

South, East

Exposure

Sheltered

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

Hardy (H4)

USDA zones

Zone 9, Zone 8, Zone 7, Zone 6

Defra's Risk register #1

Plant name

Hibiscus coccineus white-flowered (White-flowered American rose mallow)

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 coccineus white-flowered (White-flowered American rose mallow)

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 coccineus white-flowered (White-flowered American rose mallow)

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/