Chrysanthemum weyrichii (Weyrich's chrysanthemum)

Botanical name

Chrysanthemum weyrichii

Other names

Dendranthema weyrichii, Leucanthemum weyrichii, Weyrich chrysanthemum, Dwarf chrysanthemum, Weyrich's chrysanthemum, Miyabe daisy

Genus

Chrysanthemum Chrysanthemum

Species

C. weyrichii - C. weyrichii is rhizomatous, mat-forming, herbaceous perennial with rounded, fleshy, lobed, dark green leaves and, in autumn, pink or white, daisy-like flower heads with yellow central discs.

Foliage

Deciduous

Fragrance

Leaves are aromatic and flowers are strongly fragrant.

Habit

Mat Forming

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Colour

Flower

White, Pink in Autumn

Foliage

Dark-green in Spring

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How to care

Watch out for

Specific pests

Aphids , Capsid bug , Earwigs , Eelworms (leaf and bud) , Glasshouse red spider mite , Leaf-mining sawflies

Diseases

In addition to these diseases, a virus may cause stunting and leaf markings. In wet weather fungal rots may occur.

Specific diseases

Powdery mildew , Chrysanthemum white rust , Grey mould

General care

Pruning

Deadhead regularly to prevent self-seeding. Cut back after flowering to maintain compact habit.

Propagation methods

Division, Seed, Softwood cuttings

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Monthly care advice

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Where to grow

Chrysanthemum weyrichii (Weyrich's chrysanthemum) will reach a height of 0.3m and a spread of 0.5m after 1-2 years.

Suggested uses

Cottage/Informal, Beds and borders, Flower Arranging

Cultivation

Grow in moderately fertile, well-drained soil in a sheltered, sunny site.

Soil type

Clay, Loamy, Sandy

Soil drainage

Well-drained, Moist but well-drained

Soil pH

Acid, 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, Zone 4

Defra's Risk register #1

Plant name

Chrysanthemum weyrichii (Weyrich's chrysanthemum)

Common pest name

Scientific pest name

Phenacoccus solani

Type

Insect

Current status in UK

Unknown

Likelihood to spread to UK (1 is very low - 5 is very high)

4

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Watching brief for potential impact on tomato production in the Mediterranean. Other southern European countries likely to be more at risk. Precautionary action will be taken on findings on planting material to protect glasshouse crops and botanical gardens.

Defra's Risk register #2

Plant name

Chrysanthemum weyrichii (Weyrich's chrysanthemum)

Common pest name

Green semi-looper

Scientific pest name

Chrysodeixis eriosoma

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

Polyphagous moth pest which is morphologically identical to a pest already established in the UK in protected environments and being controlled by IPM. Not expected to cause greater impacts than other species of Chrysodeixis in the UK.

Defra's Risk register #3

Plant name

Chrysanthemum weyrichii (Weyrich's chrysanthemum)

Common pest name

Sugarbeet webworm; Weevil; Australian tomato; Weevil; vegetable

Scientific pest name

Listroderes costirostris

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)

3

General biosecurity comments

Awareness needs to be maintained due to the risk of entry as a 'hitchhiker' and monitoring of the pest in countries where it is known to be present.

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/