Dahlia imperialis
Tree dahlia, Giant dahlia, Imperial dahlia, Bell tree dahlia, Dahlia maximiliana, Dahlia maxonii, Dahlia arborea, Dahlia lehmannii
Dahlia Dahlia
D. imperialis - D. imperialis is an upright, vigorous, herbaceous perennial with brittle, cane-like stems bearing large pinnate, wrinkled, toothed, mid- to dark green leaves and loose panicles of lavender to mauve flowers from autumn into winter.
Dahlia imperialis is: Deciduous
Upright, Clump-forming
Lavender, Mauve in Autumn; Mauve, Lavender in Winter
Dark-green in Spring
Glasshouse red spider mite , Earwigs , Caterpillars , Capsid bug , Aphids , Leaf-mining sawflies , Slugs Glasshouse red spider mite , Earwigs , Caterpillars , Capsid bug , Aphids , Leaf-mining sawflies , Slugs
May also be susceptible to viruses and fungal rots.
Powdery mildew , Grey mould Powdery mildew , Grey mould
Do not disbud. Cut to the base in late winter. Can be cut by half in summer to encourage branching. Mulch after cutting in summer.
Take stem cuttings in late winter. Cut stem sections so that each piece contains a node. Plant in moist compost with nodes pointing up. Cover with approximately 3cm of compost. Keep compost moist.
Stem segments, Seed
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Dahlia imperialis (Tree dahlia) will reach a height of 5m and a spread of 3m after 1-2 years.
Flower Arranging, Cottage/Informal, Containers, City, Beds and borders
Grow in moist but well-drained or well-drained soil in sun. May bloom in colder areas if last frost date is delayed significantly. Mulch in mid-autumn.
Clay, Loamy, Sandy
Well-drained, Moist but well-drained
Acid, Neutral
Full Sun
South, West
Sheltered
Tender in frost (H3)
We do not currently have companion plants added for this plant.
Dahlia imperialis
Tree dahlia, Giant dahlia, Imperial dahlia, Bell tree dahlia, Dahlia maximiliana, Dahlia maxonii, Dahlia arborea, Dahlia lehmannii
Dahlia Dahlia
D. imperialis - D. imperialis is an upright, vigorous, herbaceous perennial with brittle, cane-like stems bearing large pinnate, wrinkled, toothed, mid- to dark green leaves and loose panicles of lavender to mauve flowers from autumn into winter.
Deciduous
Upright, Clump-forming
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Lavender, Mauve in Autumn; Mauve, Lavender in Winter
Dark-green in Spring
Glasshouse red spider mite , Earwigs , Caterpillars , Capsid bug , Aphids , Leaf-mining sawflies , Slugs
May also be susceptible to viruses and fungal rots.
Do not disbud. Cut to the base in late winter. Can be cut by half in summer to encourage branching. Mulch after cutting in summer.
Take stem cuttings in late winter. Cut stem sections so that each piece contains a node. Plant in moist compost with nodes pointing up. Cover with approximately 3cm of compost. Keep compost moist.
Stem segments, Seed
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Dahlia imperialis (Tree dahlia) will reach a height of 5m and a spread of 3m after 1-2 years.
Flower Arranging, Cottage/Informal, Containers, City, Beds and borders
Grow in moist but well-drained or well-drained soil in sun. May bloom in colder areas if last frost date is delayed significantly. Mulch in mid-autumn.
Clay, Loamy, Sandy
Well-drained, Moist but well-drained
Acid, Neutral
Full Sun
South, West
Sheltered
Tender in frost (H3)
Zone 10, Zone 9, Zone 8
Dahlia imperialis (Tree dahlia)
Corn borer; Corn moth; European corn borer; European maize borer; European stalk borer; Maize pyralid
Ostrinia nubilalis
Insect
Present (Limited)
3
3
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.
Dahlia imperialis (Tree dahlia)
Rice leaf nematode; Strawberry crimp disease nematode; White tip nematode; White tip nematode of rice
Aphelenchoides besseyi
Nematode
Absent
2
3
Damaging nematode affecting rice crops and strawberry production in warmer climates; could potentially present a threat to strawberry production and ornamental production in protected environments. But modern production practices seem to reduce likelihood of impacts. Pest is also regulated at EU level; which reduces likelihood of entry.
Dahlia imperialis (Tree dahlia)
Necrotic spot
Impatiens necrotic spot virus
Virus or Viroid
Present (Widespread)
2
3
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.
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: | Clay, Loamy, Sandy | Tell us... |
Soil drainage: | Well-drained, Moist but well-drained | Tell us... |
Soil pH: | Acid, Neutral | Tell us... |
Light: | Full Sun | Tell us... |
Aspect: | South, West | Tell us... |
Exposure: | Sheltered | Tell us... |
Hardiness: | Tender in frost (H3) | Tell us... |
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