Spiraea trilobata (Three-lobed spirea)

Botanical name

Spiraea trilobata

Other names

Three-lobed spirea, Asian meadowsweet

Genus

Spiraea Spiraea

Species

S. trilobata - S. trilobata is a rounded to mound-forming, deciduous shrub with rounded, three-lobed, coarsely-toothed, blue-green leaves and arching stems bearing dense, umbels of small, white flowers in late spring and early summer.

Native to

Central Asia, China, Russia, Siberia

Foliage

Deciduous

Habit

Dense, Rounded

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Colour

Flower

White in Summer

Foliage

Blue-green in Spring; Blue-green in Summer; Blue-green in Autumn

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How to care

Watch out for

Pests

Generally pest free.

Diseases

Generally disease free.

General care

Pruning

Pruning group 6. Responds to hard pruning if needs renovation.

Propagation methods

Division, Softwood cuttings

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Monthly care advice

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Where to grow

Spiraea trilobata (Three-lobed spirea) will reach a height of 1.5m and a spread of 1.5m after 5-10 years.

Suggested uses

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

Cultivation

Grow in fertile, moist but well-drained soil in full sun. Tolerates partial shade, heat, drought, heavy pruning, and a wide range of soil conditions.

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 8, Zone 7, Zone 6, Zone 5, Zone 4, Zone 3

Defra's Risk register #1

Plant name

Spiraea trilobata (Three-lobed spirea)

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 trilobata (Three-lobed spirea)

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 trilobata (Three-lobed spirea)

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