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Trees

Alnus ullungdoensis

A large, and fast growing tree, to a height of 15m, with large, oval, long serrated vibrant green leaves and a profusion of yellow catkins. These are up to 10cm in length and are borne from winter to spring

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Ultimate height

Higher than 12 metres

Time to ultimate height

10–20 years

Ultimate spread

Wider than 8 metres

Chalk

Loam

Clay

Moisture

Moist but well–drained, Poorly–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

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

Exposure

Exposed or Sheltered

Drought resistance

Yes

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Betulaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Bushy, Columnar upright
Genus: Alnus are vigorous deciduous trees and large shrubs with rounded leaves and often conspicuous catkins in winter
Name status: Unresolved

How to grow

Cultivation

This genus is noted for its ability to thrive in poor, wet conditions and is widely used in land reclamation

Propagation

Propagate by seed or hardwood cuttings

Suggested planting locations and garden types

Wildlife gardens
Architectural
Coastal
Low Maintenance

Pruning

Pruning group 1

Pests

May be susceptible to alder sucker and leaf-mining sawflies

Diseases

May be susceptible to Phytophthora and honey fungus

Get involved

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