Not the plant you're looking for? Search over 300,000 plants

Alnus glutinosa 'Imperialis'
  • RHS AGM

alder 'Imperialis'

'Imperialis' is a slow-growing medium-sized tree of conical outline and elegant habit, the leaves deeply pinnately lobed. Male catkins purplish, fruits small, cone-like

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

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

Accepted

Advertise here

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
  • Low Maintenance
Pruning

Pruning group 1

Pests

Can get alder sucker and leaf-mining sawflies

Diseases

Susceptible to Phytophthora

My Garden

Your free RHS gardening coach

Keep track of your plants with reminders & care tips – all to help you grow successfully

My plants
My calendar

My plants

My calendar

My ideas
Manage membership

My ideas

My advice

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.