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Alnus × spaethii

A large, fast-growing tree with a conical habit, to a height of over 12m, with large, long and serrated green leaves that are flushed purple when young. One of its main features is the display of yellow catkins in spring. An ideal specimen for a large space or for a street

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Size
Ultimate height
Higher than 12 metres
Time to ultimate height
20–50 years
Ultimate spread
4–8 metres
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained, Poorly–drained, Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Brown Yellow Green Purple
Summer Green Brown
Autumn Green Purple Red
Winter Brown Yellow
Position
  • Full sun
Aspect

East–facing or North–facing or South–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H7
Botanical details
Family
Betulaceae
Native to the UK
No
Foliage
Deciduous
Habit
Columnar upright
Genus

Alnus are vigorous deciduous trees and large shrubs with rounded leaves and often conspicuous catkins in winter

Name status

Correct

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How to grow

Cultivation

Grow in moderately fertile, moist but well-drained soil in full sun or part shade. Noted for its ability to thrive in poor, wet conditions but is also tolerant of dry soils once established

Propagation

Propagate by seed or hardwood cuttings

Suggested planting locations and garden types
  • Coastal
  • Wildlife gardens
  • Low Maintenance
Pruning

Pruning group 1 between leaf fall and midwinter

Pests

May be susceptible to alder sucker, alder leaf beetle and leaf-mining sawflies

Diseases

May be susceptible to Phytophthora

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