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Hibiscus syriacus 'Red Heart' (Rose mallow 'Red Heart')

Beginner
skill rating
1 hour care
per year
2.5m
Max height
2.5m
Max spread
10-20 years
To maturity

Plant details

Botanical name

Hibiscus syriacus 'Red Heart'

Other names

Rose mallow 'Red Heart', Rose of Sharon 'Red Heart'

Genus

Hibiscus Hibiscus

Variety or Cultivar

'Red Heart' _ 'Red Heart' is a mid-sized, upright, deciduous shrub with lobed, dark-green leaves. In late summer and autumn it bears single, pure white flowers with deep-red centres.


Hibiscus syriacus 'Red Heart' is: Deciduous

Habit

Bushy, Erect

Awards

RHS AGM (Award of Garden Merit)

Flower

Dark-red, White in Summer; White, Dark-red in Autumn

Foliage

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

How to care

Watch out for

Specific pests

Aphids , Mealybugs , Thrips Aphids , Mealybugs , Thrips

Powdery mildew Powdery mildew

General care

Propagation methods

Layering, Semi-hardwood cuttings


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Where to grow

Hibiscus syriacus 'Red Heart' (Rose mallow 'Red Heart') will reach a height of 2.5m and a spread of 2.5m after 10-20 years.

Suggested uses

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

Cultivation

Plant in moist but well-drained, neutral to alkaline soil in a sheltered, sunny position. Needs long, hot summers to flower well.

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.

Hardy (H4)

Companion plants

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

Botanical name

Hibiscus syriacus 'Red Heart'

Other names

Rose mallow 'Red Heart', Rose of Sharon 'Red Heart'

Genus

Hibiscus Hibiscus

Variety or Cultivar

'Red Heart' _ 'Red Heart' is a mid-sized, upright, deciduous shrub with lobed, dark-green leaves. In late summer and autumn it bears single, pure white flowers with deep-red centres.

Foliage

Deciduous

Habit

Bushy, Erect

Awards

RHS AGM (Award of Garden Merit)


Colour

Flower

Dark-red, White in Summer; White, Dark-red in Autumn

Foliage

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


How to care

Watch out for

Specific pests

Aphids , Mealybugs , Thrips

Specific diseases

Powdery mildew

General care

Propagation methods

Layering, Semi-hardwood cuttings


Monthly care advice


Where to grow

Hibiscus syriacus 'Red Heart' (Rose mallow 'Red Heart') will reach a height of 2.5m and a spread of 2.5m after 10-20 years.

Suggested uses

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

Cultivation

Plant in moist but well-drained, neutral to alkaline soil in a sheltered, sunny position. Needs long, hot summers to flower well.

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.

Hardy (H4)

USDA zones

Zone 9, Zone 8, Zone 7, Zone 6, Zone 5

Defra's Risk register #1

Plant name

Hibiscus syriacus 'Red Heart' (Rose mallow 'Red Heart')

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 syriacus 'Red Heart' (Rose mallow 'Red Heart')

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 syriacus 'Red Heart' (Rose mallow 'Red Heart')

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

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This plant likes... Garden match
Soil types: Chalky, Clay, Loamy, Sandy (will tolerate most soil types) Tell us...
Soil drainage: Moist but well-drained, Well-drained Tell us...
Soil pH: Alkaline, Neutral Tell us...
Light: Full Sun Tell us...
Aspect: South, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

DISCUSS THIS PLANT

red heart plant

my plant is not blooming i had out all winter and its got moss on it what should do also its in a planter so now what. read more

Red Heart

I have one of these shrubs which is approx 4ft tall and 3ft wide which has an abundance of buds and is already flowering as per your photo. However, it as also flowering in a light purple with a deep… read more

Limoncello

This photo and others that may appear show the 'garden' last June.(My first year of gardening!) Since then the bottlebrush by the white wall is really tall now and bursting into flower and the… read more

There is 1 active discussion about Hibiscus syriacus 'Red Heart' (Rose mallow 'Red Heart')

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GARDENS WITH THIS PLANT

My Garden
My Garden
Gill
My Garden
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pete
My Garden
My Garden
trevor eden
Front garden
Front garden
Alan Graham

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