Betula utilis var. jacquemontii (Jacquemonts's Birch)


Botanical Information

FamilyBetulaceae
GenusBetula
Speciesutilis
Varietyjacquemontii
SynonymsBetula utilis subsp. jacquemontii (Ashburner & McAllister 2013)
CategoryWoody
TypeTree (deciduous)
References 'The Genus Betula', by K. Ashburner and H. McAllister; Kew Publishing; 2013.
OriginFound from Kashmir east to central Nepal it was first collected on an expedition sponsored by Jardin des Plantes, Paris, in Kashmir by the French naturalist Victor Vincelas Jacquemont (1801-1832). Formerly known as B. utilis var. jacquemontii it has been upgraded to B. utilis subsp. jacquemontii in the recently published 'The Genus Betula', by K. Ashburner and H. McAllister; Kew Publishing; 2013.

Details

USDA Hardiness Zone7
USDA Hardiness Ref.
Canadian Hardiness Zone6b - 7a
Canada Hardiness Ref.
RHS Hardiness ZoneH6 - H5
RHS Hardiness Ref.
Temperature (°C)-18 - (-12)
Temperature (°F)0 - 10
Height20 m
Spread5 m
GrowthMedium
Flowering PeriodApril, May

Description and Growing Information

LandscapeIt may be used as a single specimen or planted in groups and may be a single stem or multiple. It has intense winter interest especially when planted in glades and groups and combined with Cornus alba and other interesting, contrasting barked plants.
PropagationPlant unchilled seeds with no covering (light is an important factor in germination), however hybridization may occur. Wild-collected seeds tend to be the most successful, and ripen in early autumn.
CultivationA rather hardy plant that does best in good light.
PestsProne to attack by several bracket fungi (especially Piptoporus betulinus), as well as by mildew and birch rust.
Notable SpecimensRoyal Botanical Gardens, Burlington, Ontario, Canada.
HabitatFound in various habitats along rivers, in woodlands, banks, scree, rough slopes and isolated pastures in Kashmir east to Nepal.
Bark/Stem DescriptionBark is white to startling white, thin, peeling in horizontal papery flakes.
Leaf DescriptionLeaves with 7-9 vein pairs, dark green above and paler beneath, turning golden-yellow in autumn, to 5-12 x 3-7 cm.
Flower DescriptionMale catkins to 12 cm.
Fruit DescriptionCatkins to 2.5-3.5 cm x 10-12 mm, with pubescent fruiting scales.

Photographs