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Spiraea thunbergii (Thunberg spiraea)

Beginner
skill rating
1 hour care
per year
1.5m
Max height
1.5m
Max spread
10-20 years
To maturity

Plant details

Botanical name

Spiraea thunbergii

Other names

Thunberg spiraea

Genus

Spiraea Spiraea

Species

S. thunbergii - S. thunbergii is a dense, bushy, deciduous or semi-evergreen shrub with arching branches bearing lance-shaped, sparsely toothed, light green leaves and corymbs of small, white flowers in spring.


Spiraea thunbergii is: Deciduous

Habit

Rounded

Awards

RHS AGM (Award of Garden Merit)

Flower

White in Spring; White in Summer

Foliage

Green in Spring; Green in Summer

How to care

Watch out for

Pests

Generally pest free.

Diseases

Generally disease free.

General care

Pruning

Pruning group 2. Will respond well to hard pruning after flowering to restore shape.

Propagation methods

Softwood cuttings


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Where to grow

Spiraea thunbergii (Thunberg spiraea) will reach a height of 1.5m and a spread of 1.5m after 10-20 years.

Suggested uses

Banks and Slopes, Cottage/Informal, Beds and borders, Low Maintenance

Cultivation

Easy to grow in any soil so long as it is moist.

Soil type

Chalky, Loamy, Sandy

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Exposed, 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

Spiraea thunbergii

Other names

Thunberg spiraea

Genus

Spiraea Spiraea

Species

S. thunbergii - S. thunbergii is a dense, bushy, deciduous or semi-evergreen shrub with arching branches bearing lance-shaped, sparsely toothed, light green leaves and corymbs of small, white flowers in spring.

Native to

China, Japan

Foliage

Deciduous

Habit

Rounded

Awards

RHS AGM (Award of Garden Merit)


Colour

Flower

White in Spring; White in Summer

Foliage

Green in Spring; Green in Summer


How to care

Watch out for

Pests

Generally pest free.

Diseases

Generally disease free.

General care

Pruning

Pruning group 2. Will respond well to hard pruning after flowering to restore shape.

Propagation methods

Softwood cuttings


Monthly care advice


Where to grow

Spiraea thunbergii (Thunberg spiraea) will reach a height of 1.5m and a spread of 1.5m after 10-20 years.

Suggested uses

Banks and Slopes, Cottage/Informal, Beds and borders, Low Maintenance

Cultivation

Easy to grow in any soil so long as it is moist.

Soil type

Chalky, Loamy, Sandy

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Exposed, 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, Zone 4

Defra's Risk register #1

Plant name

Spiraea thunbergii (Thunberg spiraea)

Common pest name

grape ground pearl

Scientific pest name

Margarodes vitis

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

Main pathway; Vitis spp. plants for planting; already prohibited. However; further consideration of other pathways is required.

Defra's Risk register #2

Plant name

Spiraea thunbergii (Thunberg spiraea)

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

Spiraea thunbergii (Thunberg spiraea)

Common pest name

pink wax scale; red was scale; ruby wax scale

Scientific pest name

Ceroplastes rubens

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

Based on its biology and low potential impact continued action on this pest in the UK would not be considered appropriate. It is likely to be of more concern to southern Member States of the EU; as it is an economic pest of citrus.

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, Loamy, Sandy Tell us...
Soil drainage: Moist but well-drained, Well-drained Tell us...
Soil pH: Acid, Alkaline, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: North, South, East, West Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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