Alnus rubra
Red alder, Western alder, Oregon alder
Alnus Alnus
A. rubra - A. rubra is a medium sized, upright, fast growing tree with large, green leaves and good autumn colour. It has catkins that decorate the tree from late autumn until spring.
Alnus rubra is: Deciduous
Conical
Pale-yellow in Winter
Green in Spring; Dark-green in Summer; Yellow in Autumn
Alder sucker , Leaf-mining sawflies Alder sucker , Leaf-mining sawflies
Bark canker Bark canker
Hardwood cuttings, Seed
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Alnus rubra (Red alder) will reach a height of 25m and a spread of 10m after 20-50 Years.
Hedging/Screens, Low Maintenance, Wildlife, Waterside, Resistant to pollution
Thrives in poor, wet conditions.
Chalky, Clay, Loamy
Boggy damp conditions, Moist but well-drained, Well-drained
Acid, Alkaline, Neutral
Partial Shade, Full Sun
North, South, East, West
Exposed, Sheltered
Hardy (H4)
Other plants that tolerate difficult situations (e.g. pollution) include birch, hawthorn, elder and willow.
We do not currently have companion plants added for this plant.
Alnus rubra
Red alder, Western alder, Oregon alder
Alnus Alnus
A. rubra - A. rubra is a medium sized, upright, fast growing tree with large, green leaves and good autumn colour. It has catkins that decorate the tree from late autumn until spring.
Deciduous
Conical
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Pale-yellow in Winter
Green in Spring; Dark-green in Summer; Yellow in Autumn
Alder sucker , Leaf-mining sawflies
Hardwood cuttings, Seed
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Alnus rubra (Red alder) will reach a height of 25m and a spread of 10m after 20-50 Years.
Hedging/Screens, Low Maintenance, Wildlife, Waterside, Resistant to pollution
Thrives in poor, wet conditions.
Chalky, Clay, Loamy
Boggy damp conditions, Moist but well-drained, Well-drained
Acid, Alkaline, Neutral
Partial Shade, Full Sun
North, South, East, West
Exposed, Sheltered
Hardy (H4)
Zone 10, Zone 9, Zone 8, Zone 7, Zone 6, Zone 5
Alnus rubra (Red alder)
Melampsoridium hiratsukanum
Fungus
Present (Limited)
5
4
Pathogen of alder; established in the UK and elsewhere.
Alnus rubra (Red alder)
Alder bleeding canker; Alder Phytophthora root disease
Phytophthora alni
Oomycete
Present (Widespread)
4
4
Damaging pathogen of Alder; first detected in the UK in 1993; which has subsequently spread to most areas. Alders are important in the context of watercourse management. No prospect of eradication or containment but possible co-ordinated action to mitigate impacts to be considered with stakeholders.
Alnus rubra (Red alder)
Phytophthora siskiyouensis
Oomycete
Present (Unknown Distribution)
3
4
Pathogen causing disease of Alder and other tree species in the USA and Australia; now detected in the UK. Could possibly be mistaken for P. alni. A PRA will help to better assess the risk to the UK.
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, Clay, Loamy | Tell us... |
Soil drainage: | Boggy damp conditions, 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... |
Other plants that tolerate difficult situations (e.g. pollution) include birch, hawthorn, elder and willow.
We do not currently have companion plants added for this plant.
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