Black alder 'Imperialis'

Alnus glutinosa 'Imperialis' | Also known as: European alder 'Imperialis', Common alder 'Imperialis', Aller 'Imperialis' | Rating: 0 votes | Print / Pdf

Alnus glutinosa, black alder or common alder will grow up to 30m in height and grows best in moist soil. It has slightly triangular rounded leaves with a shallow toothed edge that grow on short stems that are glossy and a dark green colour. It keeps its green colouring longer than most other trees that change colour in the autumn. It has red catkins that grow up to about 10cm in length. As it grows in moist conditions, the wood from this tree is very durable under water and so it's often used for building foundations. It's a flexible and light wood so it's used a lot for everything from the manufacture of pencils to cabinet making. It's also commonly used for smoking fish.

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Plant
Known dangers?
  • no
Height [m]
  • 15
Spread [m]
  • 8
Dominant flower colour
  • Purple
Flower Fragrance
  • No, neutral please
Flowering seasons
  • Mid winter
  • Late winter
  • Early winter
Foliage in spring
  • Green
Foliage in summer
  • Green
Awards?
  • Yes, let it smell
Propagation methods
  • seed
  • budding
  • Hardwood cuttings
Growth habit
  • Conical
Environment
Acidity
  • Acidic
  • Neutral
  • Alkaline
Hardiness zone
  • Z3-7
Heat zone
  • H7-1
Winter temperatures [°C]
  • -40 - -12
Heat days
  • 0 - 90
Moisture
  • well-drained
  • well-drained but frequently watered
Soil type
  • Clay
  • chalky
  • loams
Sun requirements
  • Full sun
Exposure
  • Exposed
  • Sheltered
Usage
Standard category
  • Flowers & bulbs
  • Wild flowers
Grown for
  • Ornamental Foliage
Creative category
  • For Beginners
  • Bonsai
  • Pond plants
  • Neighbour repellant
  • Author's choice
Garden type
  • Park
  • Coastal
  • Pond
  • Wildlife gardens
  • Meadows
Garden spaces
  • Hedges and screens
Gardening expertise
  • beginner
Time to reach full size
  • 30 years or longer
1 Related plants
Alnus glutinosa

Black alder

PLANTS Alnus glutinosa

Alnus glutinosa, black alder or common alder will grow up to 30m in height and grows best in moist soil. It has slightly triangular rounded leaves with a shallow toothed edge that grow on short stems that are glossy and a dark green colour. It keeps its green colouring longer than most other trees that change colour in the autumn. It has red catkins that grow up to about 10cm in length. As it grows in moist conditions, the wood from this tree is very durable under water and so it's often used for building foundations. It's a flexible and light wood so it's used a lot for everything from the manufacture of pencils to cabinet making. It's also commonly used for smoking fish.