Quercus marilandica – Blackjack oak, Jack oak

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Fagaceae

Quercus marilandica – Blackjack oak, Jack oak

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Medium-size tree with a somewhat ragged, irregular, flat-topped spherical crown. The young twigs are olive green, slightly reddish on the sunny side and later grey. The old bark is dark grey to almost black and smooth to slightly grooved. On older trees the bark has block-shaped grooves. The very strikingly shaped leaves are obovate to inverted triangular. The top is 3-lobed and the margins are smooth to shallow-lobed on the upper half. In summer the leaf is glossy dark green turning yellow-brown to yellow in autumn. The ovoid acorns are 1 to 2 cm long and semi-enclosed by the cupule. The cupule is covered with short, hairy scales and the upper edge is typically rolled inwards. A striking park tree, especially thanks to the characteristically shaped leaf. Grows naturally on the most infertile soils and so remains more shrub-shaped. Tolerates warmth well.
Our trees can only be planted when they don't have any leaves. Due to the this we will start delivering again from November 2024.
Availability
Clear stem (3)
Specifications
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Height
6 - 10 m
Crown
irregular flat-topped spherical, half-open crown
Bark and branches
twigs olive green, sometimes slightly red, bark dark grey, to almostblack, smooth to slightly grooved
Leaf
obovate to inverted triangular, smooth-edged to shallow lobed, tip 3-lobed, glossy dark green, 9 - 15 cm
Autumn colour
yellow
Flowers
green-yellow ♂ catkins, May
Fruits
ovate, 1 - 2 cm, in groups of 1 - 3, cupule with short, hairy scales
Spines/thorns
None
Toxicity
usually not toxic to people, (large) pets and livestock
Soil type
few requirements, also grows on infertile soil
Paving
tolerates no paving
Winter hardiness zone
6b (-20,5 to -17,8 °C)
Wind resistance
good
Other resistances
resistant to frost (WH 1 - 6), can withstand wind, resistant to de-icing salt
Application
industrial areas
Shape
clearstem tree
Origin
Eastern and South-Eastern USA
Clear stem tree acid soil calcareous soil clay soil loamy soil sandy soil tolerates no paving resistant to de-icing salt resistant to frost (WH 1 - 6) can withstand wind flatened spherical round/spherical 2nd size, between 6 and 12 metres half-open crown green yellowgreen average growing Attractive autumn colour non-toxic (usually)
Frequently asked questions
Quercus marilandica

Quercus marilandica can eventually reach a height of 6 - 10 m, depending on the site and climate conditions.

Quercus marilandica is average growing and can eventually reach a height of 6 - 10 m, depending on the site and climate conditions.

The leaves of Quercus marilandica turn yellow in autumn.

The right time to plant Quercus marilandica is during the dormancy period. In Western Europe, Quercus marilandica with root balls can generally be planted from mid-November to late April, although this depends strongly on the climatic conditions and the species of tree.

Quercus marilandica blooms in may.
General