Alnus incana (Grey Alder)


Botanical Information

FamilyBetulaceae
GenusAlnus
Speciesincana
CategoryWoody
TypeTree (deciduous)
OriginCanada and the northeastern United States of America.

Details

USDA Hardiness Zone2 - 6
USDA Hardiness Ref.
Canadian Hardiness Zone0a - 5b
Canada Hardiness Ref.
RHS Hardiness ZoneH7
RHS Hardiness Ref.
Temperature (°C)-46 - (-21)
Temperature (°F)-50 - (-5)
Height5 - 8 m
Spread5 - 8 m
GrowthMedium
Flowering PeriodMarch

Description and Growing Information

General DescriptionThis species is considered globally threatened and has been place on the IUCN Red List.
CultivationTolerant of infertile and drier soils.
Notable SpecimensSpooky Hollow, Port Dover, Ontario, Canada. Westonbirt, The National Arboretum, Tetbury, Gloucestershire, England.
Bark/Stem DescriptionSmooth, pale grey park with grey-downy shoots.
Leaf DescriptionLeaves 4-10 cm, broadly ovate or oval, a dull rugose green above, and white-grey downy beneath,
Flower DescriptionMale catkins grow to 5-10 cm in clusters of 3-4.
Fruit DescriptionFruit to 1.5 cm, ovoid, appearing in bunches of 4-12, sessile or shortly stalked.

Photographs