Dahlia (any variety) (Dahlia (any variety))

Botanical name

Dahlia (any variety)

Other names

Dahlia (any variety)

Genus

Dahlia Dahlia

Variety or Cultivar

Dahlia (any variety) _ If you don't know the variety name of your Dahlia, you can add this plant to your lists to get care advice.

Dahlia (any variety) are upright, bushy, clump-forming, tuberous perennials with toothed, pinnate, dark green leaves, sometimes flushed dark purple or bronze, and, from summer into autumn, strong, upright stems bearing single to double flowers in a variety of colours and forms.

Foliage

Deciduous

Habit

Clump-forming, Bushy, Upright

Colour

Flower

Red, Yellow, White, Orange, Pink, Purple in Summer; Red, White, Yellow, Orange, Pink, Purple in Autumn

Foliage

Dark-green, Dark-purple, Bronze in Spring

How to care

Watch out for

Specific pests

Glasshouse red spider mite , Earwigs , Caterpillars , Capsid bug , Aphids , Leaf-mining sawflies , Slugs

Diseases

May also be susceptible to viruses and fungal rots.

Specific diseases

Grey mould , Powdery mildew

General care

Pruning

Deadhead to prolong flowering. Cut to near ground level in autumn before lifting and storing tubers for winter.

Propagation methods

Softwood cuttings, Division

Monthly care advice

Where to grow

Dahlia (any variety) (Dahlia (any variety)) will reach a height of 1.3m and a spread of 0.6m after 1-2 years.

Suggested uses

Flower Arranging, Cottage/Informal, Containers, City, Beds and borders

Cultivation

Grow in a fertile, humus-rich well-drained soil in full sun. Stake if required. Water freely in dry periods. Lift and store tubers in autumn.

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.

Tender in frost (H3)

USDA zones

Zone 11, Zone 10, Zone 9

Defra's Risk register #1

Plant name

Dahlia (any variety) (Dahlia (any variety))

Common pest name

Corn borer; Corn moth; European corn borer; European maize borer; European stalk borer; Maize pyralid

Scientific pest name

Ostrinia nubilalis

Type

Insect

Current status in UK

Present (Limited)

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

3

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

3

General biosecurity comments

Polyphagous boring pest present in the UK since the 1930’s. A maize-affecting race was detected for the first time in 2010. Industry may wish to monitor for its presence and mitigate against impacts.

Defra's Risk register #2

Plant name

Dahlia (any variety) (Dahlia (any variety))

Common pest name

Necrotic spot

Scientific pest name

Impatiens necrotic spot virus

Type

Virus or Viroid

Current status in UK

Present (Widespread)

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

2

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

3

General biosecurity comments

Pest of mainly ornamentals and vegetables; present in the UK; and covered by the EU listing of Tomato Spotted Wilt Virus. To be kept under consideration in light of a review of the EU listing.

Defra's Risk register #3

Plant name

Dahlia (any variety) (Dahlia (any variety))

Common pest name

American serpentine leaf miner; chrysanthemum leaf miner

Scientific pest name

Liriomyza trifolii

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

Regulated pest already subject to review at the EU level (2013). Regularly intercepted in the trade.

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/