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Trees

Betula ermanii 'Cobhay Mount Hakkoda'

Erman's birch 'Cobhay Mount Hakkoda'

An upright tree, more so than many of the ermanii selections, to around 12m in height with a twiggy habit and green leaves Copper-orange bark peels back to reveal warm copper-brown colours underneath

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Ultimate height

8–12 metres

Time to ultimate height

10–20 years

Ultimate spread

4–8 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Poorly–drained

pH

Acid, Alkaline

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or South–facing or West–facing

Exposure

Exposed or Sheltered

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: Columnar upright
Genus: Betula can be deciduous trees or shrubs, usually colouring well in autumn and often with striking white, pink, or peeling brown bark; separate male and female catkins open before or with the leaves in spring
Name status: Accepted

How to grow

Cultivation

They will succeed on most soils with certain species happy even in wet sites. Although tolerant of chalk soils they will not reach a maximum size in these conditions. Best planted in a full sun

Propagation

Propagate by softwood cuttings or grafting

Suggested planting locations and garden types

Architectural
Coastal
Low Maintenance

Pruning

Pruning group 1

Pests

May be susceptible to birch borers, leaf-mining sawflies and aphids

Diseases

May be susceptible to honey fungus, a tree rust and powdery mildews

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