The sessile oak is the national tree of Ireland,[6] and an unofficial emblem in Wales[7] and Cornwall.

Significant botanical differences from pedunculate oak (Q. robur) include the stalked leaves, and the stalkless (sessile) acorns from which one of its common names is derived.

It occurs in upland areas of altitudes over 300 m (984 ft) with higher rainfall and shallow, acidic, sandy soils.

[12] As of March 2023[update], Plants of the World Online accepted five subspecies:[12] Sessile oak is one of the most important species in Europe both economically and ecologically.

[14] Rougher material is used for fence construction, roof beams and specialist building work.

During autumns with good acorn crops (the mast years), animals are traditionally grazed under the trees to fatten them.