Quercus ellipsoidalis (Jack Oak, Northern Pin Oak, Hill's Oak)


Botanical Information

FamilyFagaceae
GenusQuercus
Speciesellipsoidalis
CategoryWoody
TypeTree (deciduous)
OriginCentral and northeastern United States of America and Southwestern Canada.

Details

USDA Hardiness Zone4 - 7
USDA Hardiness Ref.
Canadian Hardiness Zone3a - 7a
Canada Hardiness Ref.
RHS Hardiness ZoneH7
RHS Hardiness Ref.
Temperature (°C)-30
Temperature (°F)-5
Height18 m
Spread5 m
GrowthSlow

Description and Growing Information

General DescriptionThis species has been placed on the IUCN Red List as least concern.
ShapeUpright cylindrical to conical.
LandscapeIn mass plantings, as an accent tree for its autumn interest or as a specimen.
PropagationBy seed.
CultivationPlant under full sun in moist but well-drained soil of any acidity or type.
PestsScale, oak skeletonizer, leaf miner, galls, oak lace bugs, borers, caterpillars and nut weevils. May get chlorosis in poor soils.
Notable SpecimensSt Albert Botanic Park, St Albert, Alberta, Canada.
HabitatSandy, lime-free soils at an altitude of 150-500 m.
Bark/Stem DescriptionSmooth, brown bark becoming rougher with maturity and dark brown twigs.
Flower/Leaf Bud DescriptionOvoid, reddish-brown, 3-5 mm in length.
Leaf DescriptionGlossy green with a paler underside measuring 7.5 - 13 x 6 - 10 cm. 3 lobes with bristle-tips.
Fruit DescriptionAcorn, ellipsoid or rounded, brown, 1.2-2 cm.
Colour DescriptionBright medium green leaves that turn a ruby red in autumn.
Texture DescriptionMedium.

Photographs