Quercus alba (White Oak, Eastern White Oak)


Botanical Information

FamilyFagaceae
GenusQuercus
Speciesalba
CategoryWoody
TypeTree (deciduous)
OriginNative to North America. This species has been placed on the IUCN Red List as least concern.
Pronunciation

Details

USDA Hardiness Zone3 - 9
USDA Hardiness Ref.
Canadian Hardiness Zone4
Canada Hardiness Ref.
RHS Hardiness ZoneH7 - H3
RHS Hardiness Ref.
Temperature (°C)-37 - (-1)
Temperature (°F)-35 - 30
Height24 - 33 m
Spread20 - 30 m
GrowthMedium
Flowering PeriodApril, May

Description and Growing Information

General DescriptionA large tree, often a rounded pyramidal form, leaves frequently blemished and best suited to the naturalized landscape.
ID CharacteristicShallow lobed leaves, shiny green on top and dull underside.
ShapeIrregularly spreading, often horizontally, large and rounded crown.
LandscapeLimited use in the cultured landscape since there are many more attractive options. Suited to naturalization projects and park-like landscapes.
PropagationCommonly through seed.
CultivationMoist, acidic, well drained soil in full sun. Drought tolerant.
PestsTent caterpillar, gypsy moth, oak leaftier, oak leaf-roller, scarlet oak sawfly, anthracnose, oak tatters, oak wilt and mistletoe.
Notable SpecimensBasking Ridge, New Jersey, United States of America. The oldest white oak in North America (600 years old).
HabitatDry slopes, low lands, ravines and valleys at an altitude of 0-1,600 m.
Bark/Stem DescriptionFinely fissured, scaly plates, twigs maturing and glabrous.
Flower/Leaf Bud DescriptionOvoid, pointed and 3 mm in length.
Leaf DescriptionElliptic, frequently blemished, 3-9 deep rounded lobes, a cuneate base, a deep red midrib and 5 - 7 secondary veins on either side of the midvein, 8-20 cm long and 5-10 cm wide.
Fruit DescriptionAcorns, long and egg shaped. About 2 - 3 cm in length.
Colour DescriptionBark is light grey. Leaves have a bright green top, whitish-grey underside and are reddish-brown in autumn.
Texture DescriptionSmooth and thin.

Photographs