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Woody > Alnus > Alnus glutinosa > Alnus glutinosa 'Imperialis'

Alnus glutinosa

'Imperialis'


Imperial Alder




Family
Betulaceae
Genus
Alnus
Species
glutinosa
Cultivar
'Imperialis'
Category
Woody
Type
Tree (deciduous)
USDA Hardiness Zone
3
Canadian Hardiness Zone
1
RHS Hardiness Zone
H7
Temperature (°C)
-40 - (-35)
Temperature (°F)
-40 - (-30)
Height
20 m
Photographs
Description and Growing Information
Flowering Period
AprilMay
Cultivation
Tolerates infertile soil, being very lime-tolerant, as well as tolerating very wet sites, including standing water up to 30 cm deep.
Shape
A weak, open shrub.
Growth
Slow
Habitat
Horticultural origin.
Bark/Stem Description
Bark is brown-black, with thin branches.
Leaf Description
Leaves are 4-10 cm, persisting well into autumn, dark lustrous green on top, paler underneath. The 'Imperialis' cultivar has especially deeply cut narrow lobes.
Flower Description
Male catkins grow to 5-10 cm, appearing in groups of 3-5, while the female catkins grow to 1-2 cm, ovoid, in groups of 3-8.
Notable Specimens
Whistling Gardens, Wilsonville, Ontario, Canada.
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