Quercus glauca (Ara-kasi (Japanese), Blue Japanese Oak)


Botanical Information

FamilyFagaceae
GenusQuercus
Speciesglauca
CategoryWoody
TypeTree (evergreen), Shrub (evergreen)
OriginHimalaya to Japan.

Details

USDA Hardiness Zone7 - 8
USDA Hardiness Ref.
Canadian Hardiness Zone6b -8a
Canada Hardiness Ref.
RHS Hardiness ZoneH5 - H4
RHS Hardiness Ref.
Temperature (°C)(-15) - (-7)
Temperature (°F)5 - 20
Height10-20 m
GrowthSlow

Description and Growing Information

General DescriptionThis species has been placed on the IUCN Red List as least concern.
HabitatForests at an altitude of 100-2,600 m.
Bark/Stem DescriptionSmooth, blackish brown becoming furrowed and rough with age. Glabrescent, thick dark olive green twigs.
Flower/Leaf Bud DescriptionOvoid, reddish-brown, clustered in 5-7, 3-8 mm.
Leaf DescriptionOboval to oblong-elliptic, thick, glossy dark green with a blueish-green, pubescent underside, a rounded or cuneate base and 9-13 slightly curved veins on either side of the midvein, 6-13 x 2.5-5 cm.
Flower DescriptionDrooping male catkins.
Fruit DescriptionAcorn, ovoid, oblong-ovoid or ellipsoid, 1-1.6 x 0.9-1.4 cm.

Photographs